This plugin lets you explore and analyze data stored on floppy disks and MFM/RLL hard drives at the very low level using Sigrok/Sigrok-cli(github)/PulseView(github)/DSView Logic Analyzer software.
Start by loading one of available test sample files or capture you own data using Logic Analyzer hardware. Aim for 20x oversampling for best results.
- Floppies require at least ~12MHz sampling rate within reach of ~$60 Hantek 6022 or $5 CY7C68013A https://sigrok.org/wiki/Lcsoft_Mini_Board dev board (aliexpress/ebay/amazon) as thats pretty much whats inside the Hantek/original Saleae.
- Hard drives operate at 5-15Mbit flux rate and demand at least 100MHz sampling clock for the 5Mbit MFM models. Commercial LAs start around $200, saner options are 200Ms/s Pico based MFM-Hard-Disk-Dumper by Tronix286 or not so greatly named but outstandingly capable Pico/Pico2 based 400Ms/s LogicAnalyzer. Both of those Open Source hardware solutions are vastly cheaper while delivering great results.
Typical track on MFM encoded hard drive.
This is a spare/unused sector created at the end of every track on MFM drive by Seagate ST21 controller. Notice the weird Sector number 254 and absence of GAP3 between end of Header and start of Sync pattern. Without GAP3 writing to this sector would causes corruption giving us a hint that this special Sector is not meant to ever be used. Every MFM/RLL drive I looked at so far wasted precious space either leaving enought unused disk surface for one more sector per track of having one dummy sector at the end like above. I know of only DEC RQDX1/2 using all 18 sectors, but DECs next RQDX3 controller went back to 17. This translates to never using 6% of MFM and 4% of RLL disk surface you paid for, about 2.5MB on typical 40MB MFM drive. For comparison 15 years later transition to 4K Sectors (88->97% efficiency gain) was the result of HDD manufacturers fighting for every scrap of capacity.
-
fdd_fm.sr 15MHz sample rate. FDD, 5:1 interleave. 125000 bps, FM format, 256 Byte Sectors, Data CRC 16bit, Data poly 0x1021
-
fdd_mfm.sr 15MHz sample rate. FDD, 5:1 interleave. Cylinder 1, Head 0. 250000 bps, MFM format, 256 Byte Sectors, Data CRC 16bit, Data poly 0x1021
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hdd_mfm_RQDX3.sr 100MHz sample rate. 5000000 bps, MFM format, 512 Byte Sectors, Data CRC 32bit, Data poly 0xA00805.
DEC RD54 (re-branded Maxtor XT-2190) containing VMS. Paired to build-in SMC HDC9224 (RQDX3 compatible?) disk controller in VAXstation2000. Note: Drive had rather spectacularly blown Index pulse generator captured on video. -
hdd_mfm_RQDX3.dsl as above but in DSView format
-
hdd_mfm_RQDX3_sector.sr one sector (sec=8) from above capture. ID CRC F38D, Data CRC C1847279
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hdd_mfm_AMS1100M4.sr 200MHz sample rate. Cylinder 622, Head 1. Bad Sector 9. 5000000 bps, MFM format, Header format 3, Data poly 0x140a0445.
Seagate ST-251 formatted using American Multisource (AMS) 1100M4 (AIC-6060/CL-SH260, SSI 32D534) -
hdd_mfm_EV346.sr 200MHz sample rate. Cylinder 819, Head 2. 5000000 bps, MFM format, Header format 3, Data poly 0x140a0445.
Seagate ST-251 formatted using Everex EV-346 (CL-SH260, SSI 32D534) -
hdd_mfm_WD1003V-MM2.sr 200MHz sample rate. 5000000 bps, MFM format, Header format 3, Data poly 0x140a0445.
Seagate ST-278R formatted using WD1003V-MM2 (WD42C22A, WD10C22B) -
hdd_mfm_WD1003V-MM2_int.sr 200MHz sample rate. 2:1 interleave. 5000000 bps, MFM format, Header format 3, Data poly 0x140a0445.
Seagate ST-251 formatted using WD1003V-MM2 (WD42C22A, WD10C22B) -
hdd_mfm_NDC5525.sr 200MHz sample rate. 2:1 interleave. 5000000 bps, MFM format, Header format 3, Data poly 0x140a0445.
Seagate ST-251 formatted using NCL America Computer NDC5525 (NEC Z80, various NCL chips) -
hdd_mfm_OMTI8240.sr 200MHz sample rate. Track 4919: Cylinder 819, Head 5. 5000000 bps, MFM format, Header format OMTI, Header CRC 32bit, Header poly 0x0104c981, Header CRC init 0x2605fb9c, Data poly 0x0104c981, Data CRC init 0xd4d7ca20.
Seagate ST-251 on Scientific Micro Systems Inc. OMTI 8240 (Z8 micro, OMTI 20516 aka OMTI 5098, OMTI 20507 aka 5070) -
hdd_mfm_ST21M.sr 200MHz sample rate. Track 6, Cylinder 1, Head 0. 5000000 bps, MFM format, Header format Seagate, Header CRC 32bit, Header poly 0x41044185, Header CRC init 0, Data poly 0x41044185, Data CRC init 0.
Seagate ST-251 on Seagate ST21M (custom Seagate VLSI) -
hdd_mfm_ST21M_2.sr 200MHz sample rate. Track 6, Cylinder 1, Head 0. 5000000 bps, MFM format, Header format Seagate, Header CRC 32bit, Header poly 0x41044185, Header CRC init 0, Data poly 0x41044185, Data CRC init 0.
Seagate ST-278R on Seagate ST21M (custom Seagate VLSI) -
hdd_rll_ACB4070.sr 200MHz sample rate. 2:1 interleave. 7500000 bps, RLL_Adaptec4070 format, Header format Adaptec4070, Header CRC 32bit, Header poly 0x41044185, Header CRC init 0, Data poly 0x41044185, Data CRC init 0. Requires more aggressive pll_kp=1 due to wobbly timings.
Seagate ST251 on Adaptec ACB-4070 RLL to SCSI bridge (AIC-300F, AIC-010F) from Mattis Linds ABC1600 containing DNIX 5.3 (UNIX SVR3) -
hdd_rll_ACB2370A.sr 200MHz sample rate. 7500000 bps, RLL_Adaptec format, Header format Adaptec, Header CRC init 0, Data ECC 48bit, Data poly 0x181814503011, Data CRC init 0x010000000000.
Seagate ST251 on Adaptec ACB-2370A (AIC-610F, AIC-280L, AIC-270L, AIC-6225) -
hdd_rll_ACB2372.sr 200MHz sample rate. 2:1 interleave. 7500000 bps, RLL_Adaptec format, Header format Adaptec, Header CRC init 0, Data ECC 48bit, Data poly 0x181814503011, Data CRC init 0x010000000000.
Seagate ST-278R on Adaptec ACB-2372 (AIC-610F, AIC-280L, AIC-270L, AIC-6225) -
hdd_rll_ST21R.sr 200MHz sample rate. 7500000 bps, RLL_Seagate format, Header format Seagate, Header CRC 32bit, Header poly 0x41044185, Header CRC init 0, Data poly 0x41044185, Data CRC init 0.
Seagate ST-278R on Seagate ST21R (custom Seagate VLSI) -
hdd_rll_WD1003V-SR1.sr 200MHz sample rate. 7500000 bps, RLL_WD format, Header format 3, Data ECC 56bit, Data poly 0x140a0445000101.
Seagate ST-278R WD1003V-SR1 (WD42C22A, WD10C22B) -
hdd_rll_WD1003V-SR1int.sr 200MHz sample rate. 2:1 interleave. 7500000 bps, RLL_WD format, Header format 3, Data ECC 56bit, Data poly 0x140a0445000101.
Seagate ST-251 WD1003V-SR1 (WD42C22A, WD10C22B) -
hdd_rll_WD1006V-SR2.sr 200MHz sample rate. 7500000 bps, RLL_WD format, Header format 3, Data ECC 56bit, Data poly 0x140a0445000101.
Seagate ST-251 WD1006V-SR2 (WD42C22A, WD10C22B) -
hdd_rll_OMTI8247.sr 200MHz sample rate. 7500000 bps, RLL_OMTI format, Header format OMTI, Header CRC init 0x7107, Data ECC 48bit, Data poly 0x181814503011, Data CRC init 0x6062ebbf22b4.
Seagate ST-251 on Scientific Micro Systems Inc. OMTI 8247 (Z8 micro, OMTI 20516 aka OMTI 5098, OMTI 20527 aka 5027) -
hdd_rll_DTC7287_track4919
DTC7287 captures 200MHz sample rate. 7500000 bps, Broken unknown RLL_DTC7287_unknown format, Header format unknown
ST-251 on Data Technology Corporation DTC-7287 Format looks very ESDI like. Help deciphering appreciated.
Huge thanks to Al Kossow for providing majority of the samples hosted by bitsavers.
leading_edge Leading Edge specifies edge type for signal detection.
Default: rising Values: rising, falling
data_rate Data Rate in bits per second (bps).
Default: 5000000 Values: 125000, 150000, 250000, 300000, 500000, 5000000, 7500000, 10000000
format Encoding schemes available. 'custom' lets you build own decoder interactively in the GUI fully controlling its behavior.
Default: MFM Values: FM, MFM, RLL_Seagate, RLL_Adaptec, RLL_Adaptec4070, RLL_WD, RLL_OMTI, custom, RLL_DTC7287_unknown
header_format Header payload length in bytes.
Default: 4 Values: 3, 4, Seagate, OMTI, Adaptec, Adaptec4070
sector_size Sector payload length in bytes.
Default: auto Values: auto, 128, 256, 512, 1024, 2048, 4096, 8192, 16384
header_crc_size Header field CRC size in bits.
Default: 16 Values: 16, 32
header_crc_poly Polynomial used in Header field CRC calculation. Default is the standard CRC-CCITT polynomial (x16 + x12 + x5 + 1).
Default: 0x1021 (CRC-CCITT)
header_crc_init Initial value for Header field CRC calculation.
Default: 0xffffffff
data_crc_size Data field CRC size in bits.
Default: 32 Values: 16, 32, 48, 56
data_crc_poly Polynomial used in Data field CRC calculation.
Default: 0xA00805 Values: 0x1021 (CRC-CCITT), 0xA00805 (CRC32-CCSDS), 0x140a0445, 0x0104c981, 0x41044185, 0x140a0445000101
data_crc_poly_custom Custom Data field Polynomial, overrides data_crc_poly setting.
Default: `` (empty string)
data_crc_init Initial value for Data field CRC calculation.
Default: 0xffffffffffffff
time_unit Select Pulse time units or number of half-bit windows.
Default: ns Values: ns, us, auto, window
dsply_sn Display additonal sample numbers for Pulses (pul, erp) and Windows (bit/clock).
Default: no Values: yes, no
report Display report after encountering specified field type.
Default: no Values: no, IAM (Index Mark), IDAM (ID Address Mark), DAM (Data Address Mark), DDAM (Deleted Data Address Mark)
report_qty Number of Marks (specified above) between reports. This is a workaround for lack of sigrok/pulseview capability to signal end_of_capture.
Default: 9 Example: 9 for floppies, 17 for MFM hdd, 26 for RLL drives
decoder Choice between PI Loop Filter based PLL, or legacy with hardcoded immediate andustments.
Default: PLL Values: PLL, legacy
pll_sync_tolerance PLL: Initial tolerance when catching synchronization sequence.
Default: 25% Values: 15%, 20%, 25%, 33%, 50%
pll_kp PLL: PI Filter proportinal constant (Kp).
Default: 0.5
pll_ki PLL: PI Filter integral constant (Ki).
Default: 0.0005
dsply_pfx Legacy decoder: Display all MFM C2 and A1 prefix bytes (encoded with special glitched clock) to help with locating damaged records.
Default: no Values: yes, no
Options with custom_encoder_ prefix activated by selecting encoding=custom:
custom_encoder_limits Coding.
Default: RLL Values: FM, MFM, RLL
custom_encoder_codemap Code translation map.
Default: IBM Values: FM/MFM, IBM, WD
custom_encoder_sync_pulse Width of pulses used in a repeating sequence (called PLO sync field or preamble) to train PLL and aquire initial lock.
Default: 4 Values: 2, 3, 4
Warning! All custom_encoder_ options below must obey stupid rules when used from command line. sigrok-cli command line input doesnt support "" escaped strings nor commas. We have to resort to custom escaping with , becoming - and _ used to separate lists:
    for [8, 3, 5], [5, 8, 3, 5], [7, 8, 3, 5] pass 8-3-5_5-8-3-5_7-8-3-5
    for [8, 3, 5] pass 8-3-5
    for 11, 12 pass 11-12
    for 0x1E, 0x5E, 0xDE pass 0x1E-0x5E-0xDE or 30-95-222
PulseView/DSView GUI is much more flexible and allows omitting outer brackets, all of those are allowed:
    8-3-5
    8,3,5
    [8, 3, 5]
    [[8, 3, 5]]
    [8, 3, 5], [5, 8, 3, 5]
    [[8, 3, 5], [5, 8, 3, 5]]
    8-3-5_5-8-3-5_7-8-3-5
custom_encoder_sync_marks Special (often invalid on purpose) sequences of pulses used to distinguish Synchronization Marks.
Default: `` (empty string) Example: [[8, 3, 5], [5, 8, 3, 5], [7, 8, 3, 5]] used by RLL_WD
custom_encoder_shift_index Every sync_sequences entry has its own offset defining number of valid halfbit windows already shifted in (minus last entry because PLLstate.decoding adds self.halfbit_cells) at the moment of matched Sync Sequence. Define one common value or provide list of values for every sync_sequences entry.
Default: `` (empty string) Example: 11 or `11, 11` for RLL_OMTI
All custom_encoder_ _mark options below support * wildcard, useful when debugging new format and unsure of proper values. For example setting custom_encoder_nop_mark=* will start decoding bytes as soon as custom_encoder_sync_marks is matched. After that you can manipulate custom_encoder_shift_index to arrive at proper bit alignment. Greatly simplifies adding new encoding formats.
custom_encoder_IDData_mark IDData_mark is usually 0xA1 for MFM FDD and HDD.
Default: `` (empty string) Example: 0xA1
custom_encoder_ID_mark ID_mark makes decoder skip straight to decoding Header.
Default: `` (empty string) Example: 0xFE used by original FM floppies
custom_encoder_Data_mark Data_mark makes decoder skip straight to decoding Data.
Default: `` (empty string) Example: 0xFB used by original FM floppies
custom_encoder_ID_prefix_mark ID_prefix_mark is a Header Mark to be followed by IDData_mark.
Default: `` (empty string) Example: 0x1E weird arrangement used by RLL_Seagate
custom_encoder_nop_mark nop_mark is an inert Mark.
Default: `` (empty string) Example: 0x1E, 0x5E, 0xDE for RLL_Adaptec
| Group | Message |
|---|---|
pulses |
pul (pulse), erp (bad pulse = out-of-tolerance leading edge) |
windows |
clk (clock), dat (data), erw (extra pulse in win), unk |
prefixes |
pfx (A1, C1 MFM synchronization prefixes) |
bits |
erb (bad bit = encoded using glitched clock with some omitted pulses, usually in synchronization Marks), bit |
bytes |
byt (byte) |
fields |
syn (sync), mrk (mark), rec (record), crc (crc ok), cre (crc bad) |
errors |
err (error) |
reports |
rpt (report) |
Use '-A mfm=' with whole groups like fields, individual messages crc:cre or combination fields:err.
    '-A mfm=fields'
    '-A mfm=crc:cre'
    '-A mfm=fields:err'
| Name | Meaning |
|---|---|
id |
raw ID Records (Header contents) |
data |
raw Data Records, order as on track |
iddata |
combined ID + Data Records, order as on track |
idcrc |
whole ID Records including Address Mark and crc useful for reverse engineering Header CRC |
datacrc |
whole Data Records including Address Mark and crc useful for reverse engineering Data CRC |
tr |
dgesswein/mfm transitions file format |
ex |
dgesswein/mfm extract file format |
Use '-B mfm=' with a name of desired output like iddata, or combination like id:data producing same output as iddata. idcrc and datacrc are used for reverse engineering non standard CRC parameters (Polynomial and Init). tr and ex unsupported while Im figuring out how to implement it efficiently. At the moment output only in order as on track meaning some post processing required when converting interleaved tracks to disk images. Redirect output to a file to grab it or pipe it to another program.
    '-B mfm=idcrc > header_crc.bin'
    '-B mfm=iddata > track_dump.img'
    '-B mfm=id:data > track_dump.img'
Show fields and raw bytestream:
sigrok-cli -D -i samples\hdd_mfm_RQDX3_sector.sr -P mfm -A mfm=bytes:fields
mfm-1: A1
mfm-1: Sync pattern 13 bytes
mfm-1: FE
mfm-1: ID Address Mark
mfm-1: 00
mfm-1: 00
mfm-1: 08
mfm-1: 02
mfm-1: ID Record: cyl=0, sid=0, sec=8, len=512
mfm-1: F3
mfm-1: 8D
mfm-1: CRC OK F38D
mfm-1: 4E 'N'
mfm-1: A1
mfm-1: Sync pattern 13 bytes
mfm-1: FB
mfm-1: Data Address Mark
mfm-1: 20 ' '
mfm-1: 3D '='
mfm-1: 20 ' '
mfm-1: 98
mfm-1: 40 '@'
mfm-1: A1
mfm-1: 90
mfm-1: 00
mfm-1: 00
mfm-1: 0F
mfm-1: 07
mfm-1: 2E '.'
mfm-1: 20 ' '
mfm-1: 42 'B'
mfm-1: 59 'Y'
mfm-1: 54 'T'
mfm-1: 45 'E'
mfm-1: 53 'S'
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 10
mfm-1: 53 'S'
mfm-1: 4B 'K'
mfm-1: 49 'I'
mfm-1: 50 'P'
mfm-1: 2F '/'
mfm-1: 53 'S'
mfm-1: 50 'P'
mfm-1: 41 'A'
mfm-1: 43 'C'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 43 'C'
mfm-1: 4F 'O'
mfm-1: 55 'U'
mfm-1: 4E 'N'
mfm-1: 54 'T'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 04
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 0F
mfm-1: 0B
mfm-1: 53 'S'
mfm-1: 4B 'K'
mfm-1: 49 'I'
mfm-1: 50 'P'
mfm-1: 2F '/'
mfm-1: 53 'S'
mfm-1: 50 'P'
mfm-1: 41 'A'
mfm-1: 43 'C'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 98
mfm-1: 40 '@'
mfm-1: 70 'p'
mfm-1: 90
mfm-1: 00
mfm-1: 00
mfm-1: 0F
mfm-1: 10
mfm-1: 2E '.'
mfm-1: 20 ' '
mfm-1: 54 'T'
mfm-1: 41 'A'
mfm-1: 50 'P'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 4D 'M'
mfm-1: 41 'A'
mfm-1: 52 'R'
mfm-1: 4B 'K'
mfm-1: 53 'S'
mfm-1: 2F '/'
mfm-1: 52 'R'
mfm-1: 45 'E'
mfm-1: 43 'C'
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0F
mfm-1: 18
mfm-1: 4D 'M'
mfm-1: 45 'E'
mfm-1: 53 'S'
mfm-1: 53 'S'
mfm-1: 41 'A'
mfm-1: 47 'G'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 42 'B'
mfm-1: 55 'U'
mfm-1: 46 'F'
mfm-1: 46 'F'
mfm-1: 45 'E'
mfm-1: 52 'R'
mfm-1: 20 ' '
mfm-1: 4E 'N'
mfm-1: 4F 'O'
mfm-1: 54 'T'
mfm-1: 20 ' '
mfm-1: 56 'V'
mfm-1: 41 'A'
mfm-1: 4C 'L'
mfm-1: 49 'I'
mfm-1: 44 'D'
mfm-1: 05
mfm-1: 04
mfm-1: 05
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0F
mfm-1: 0E
mfm-1: 4D 'M'
mfm-1: 45 'E'
mfm-1: 53 'S'
mfm-1: 53 'S'
mfm-1: 41 'A'
mfm-1: 47 'G'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 42 'B'
mfm-1: 55 'U'
mfm-1: 46 'F'
mfm-1: 46 'F'
mfm-1: 45 'E'
mfm-1: 52 'R'
mfm-1: 05
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 06
mfm-1: 58 'X'
mfm-1: 53 'S'
mfm-1: 54 'T'
mfm-1: 41 'A'
mfm-1: 54 'T'
mfm-1: 31 '1'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 04
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 06
mfm-1: 58 'X'
mfm-1: 53 'S'
mfm-1: 54 'T'
mfm-1: 41 'A'
mfm-1: 54 'T'
mfm-1: 32 '2'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 04
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 0F
mfm-1: 13
mfm-1: 44 'D'
mfm-1: 45 'E'
mfm-1: 41 'A'
mfm-1: 44 'D'
mfm-1: 20 ' '
mfm-1: 54 'T'
mfm-1: 52 'R'
mfm-1: 41 'A'
mfm-1: 43 'C'
mfm-1: 4B 'K'
mfm-1: 20 ' '
mfm-1: 43 'C'
mfm-1: 48 'H'
mfm-1: 41 'A'
mfm-1: 4E 'N'
mfm-1: 4E 'N'
mfm-1: 45 'E'
mfm-1: 4C 'L'
mfm-1: 20 ' '
mfm-1: 18
mfm-1: 01
mfm-1: 0F
mfm-1: 01
mfm-1: 2E '.'
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 0F
mfm-1: 19
mfm-1: 44 'D'
mfm-1: 45 'E'
mfm-1: 41 'A'
mfm-1: 44 'D'
mfm-1: 20 ' '
mfm-1: 54 'T'
mfm-1: 52 'R'
mfm-1: 41 'A'
mfm-1: 43 'C'
mfm-1: 4B 'K'
mfm-1: 20 ' '
mfm-1: 50 'P'
mfm-1: 41 'A'
mfm-1: 52 'R'
mfm-1: 49 'I'
mfm-1: 54 'T'
mfm-1: 59 'Y'
mfm-1: 20 ' '
mfm-1: 43 'C'
mfm-1: 48 'H'
mfm-1: 41 'A'
mfm-1: 4E 'N'
mfm-1: 4E 'N'
mfm-1: 45 'E'
mfm-1: 4C 'L'
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 06
mfm-1: 58 'X'
mfm-1: 53 'S'
mfm-1: 54 'T'
mfm-1: 41 'A'
mfm-1: 54 'T'
mfm-1: 33 '3'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 04
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 0F
mfm-1: 1C
mfm-1: 4D 'M'
mfm-1: 49 'I'
mfm-1: 43 'C'
mfm-1: 52 'R'
mfm-1: 4F 'O'
mfm-1: 20 ' '
mfm-1: 44 'D'
mfm-1: 49 'I'
mfm-1: 41 'A'
mfm-1: 47 'G'
mfm-1: 4E 'N'
mfm-1: 4F 'O'
mfm-1: 53 'S'
mfm-1: 54 'T'
mfm-1: 49 'I'
mfm-1: 43 'C'
mfm-1: 20 ' '
mfm-1: 45 'E'
mfm-1: 52 'R'
mfm-1: 52 'R'
mfm-1: 4F 'O'
mfm-1: 52 'R'
mfm-1: 20 ' '
mfm-1: 43 'C'
mfm-1: 4F 'O'
mfm-1: 44 'D'
mfm-1: 45 'E'
mfm-1: 20 ' '
mfm-1: 1A
mfm-1: 03
mfm-1: 03
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 07
mfm-1: 04
mfm-1: 00
mfm-1: 00
mfm-1: 05
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 01
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 02
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 08
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 0B
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 06
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 10
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 0E
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 0A
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 03
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 0F
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 0C
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 07
mfm-1: 00
mfm-1: 00
mfm-1: 00
mfm-1: 4D 'M'
mfm-1: 41 'A'
mfm-1: 53 'S'
mfm-1: 53 'S'
mfm-1: 42 'B'
mfm-1: 55 'U'
mfm-1: 53 'S'
mfm-1: 00
mfm-1: 30 '0'
mfm-1: 00
mfm-1: 44 'D'
mfm-1: 41 'A'
mfm-1: 49 'I'
mfm-1: 47 'G'
mfm-1: 4E 'N'
mfm-1: 4F 'O'
mfm-1: 53 'S'
mfm-1: 54 'T'
mfm-1: 49 'I'
mfm-1: 43 'C'
mfm-1: 20 ' '
mfm-1: 4D 'M'
mfm-1: 4F 'O'
mfm-1: 44 'D'
mfm-1: 45 'E'
mfm-1: 41 'A'
mfm-1: 42 'B'
mfm-1: 41 'A'
mfm-1: 2F '/'
mfm-1: 42 'B'
mfm-1: 05
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 06
mfm-1: 4D 'M'
mfm-1: 46 'F'
mfm-1: 20 ' '
mfm-1: 43 'C'
mfm-1: 53 'S'
mfm-1: 31 '1'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 08
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: 6C 'l'
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: 82
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: 98
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: AE
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 08
mfm-1: 0F
mfm-1: 05
mfm-1: 4D 'M'
mfm-1: 46 'F'
mfm-1: 20 ' '
mfm-1: 49 'I'
mfm-1: 53 'S'
mfm-1: 0D
mfm-1: 18
mfm-1: 1C
mfm-1: 08
mfm-1: 08
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: B2
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: 0F
mfm-1: 01
mfm-1: 20 ' '
mfm-1: 0D
mfm-1: 28 '('
mfm-1: 95
mfm-1: 40 '@'
mfm-1: C8
mfm-1: AA
mfm-1: 00
mfm-1: 00
mfm-1: 04
mfm-1: Data Record
mfm-1: C1
mfm-1: 84
mfm-1: 72 'r'
mfm-1: 79 'y'
mfm-1: CRC OK C1847279
mfm-1: 00
Dirty cut|tr trick to extrack strings from above output:
sigrok-cli.exe -D -i samples\hdd_mfm_RQDX3_sector.sr -P mfm -A mfm=bytes | cut -c 12 | tr -d '\n'
N = @. BYTES SKIP/SPACE COUNT (SKIP/SPACE @p. TAPE MARKS/REC MESSAGE BUFFER NOT VALID MESSAGE BUFFER XSTAT1 XSTAT2 (DEAD TRACK CHANNEL . (DEAD TRACK PARITY CHANNEL XSTAT3 (MICRO DIAGNOSTIC ERROR CODE MASSBUS0DAIGNOSTIC MODEABA/B MF CS1 (@l (@ (@ (@ MF IS (@ (@ry
Proper binary dump of same sector to the screen using xxd:
sigrok-cli.exe -D -i samples\hdd_mfm_RQDX3_sector.sr -P mfm -B mfm=data | xxd
00000000: 203d 2098 40a1 9000 000f 072e 2042 5954 = .@....... BYT 00000010: 4553 040f 0120 0d08 0f10 534b 4950 2f53 ES... ....SKIP/S 00000020: 5041 4345 2043 4f55 4e54 0d18 1c08 0404 PACE COUNT...... 00000030: 0f01 200d 280f 0b53 4b49 502f 5350 4143 .. .(..SKIP/SPAC 00000040: 4520 9840 7090 0000 0f10 2e20 5441 5045 E .@p...... TAPE 00000050: 204d 4152 4b53 2f52 4543 040f 0120 0f18 MARKS/REC... .. 00000060: 4d45 5353 4147 4520 4255 4646 4552 204e MESSAGE BUFFER N 00000070: 4f54 2056 414c 4944 0504 050f 0120 0f0e OT VALID..... .. 00000080: 4d45 5353 4147 4520 4255 4646 4552 0504 MESSAGE BUFFER.. 00000090: 0f01 200d 080f 0658 5354 4154 310d 181c .. ....XSTAT1... 000000a0: 0804 040f 0120 0d08 0f06 5853 5441 5432 ..... ....XSTAT2 000000b0: 0d18 1c08 0404 0f01 200d 280f 1344 4541 ........ .(..DEA 000000c0: 4420 5452 4143 4b20 4348 414e 4e45 4c20 D TRACK CHANNEL 000000d0: 1801 0f01 2e04 0f01 200d 280f 1944 4541 ........ .(..DEA 000000e0: 4420 5452 4143 4b20 5041 5249 5459 2043 D TRACK PARITY C 000000f0: 4841 4e4e 454c 040f 0120 0d08 0f06 5853 HANNEL... ....XS 00000100: 5441 5433 0d18 1c08 0404 0f01 200d 280f TAT3........ .(. 00000110: 1c4d 4943 524f 2044 4941 474e 4f53 5449 .MICRO DIAGNOSTI 00000120: 4320 4552 524f 5220 434f 4445 201a 0303 C ERROR CODE ... 00000130: 040f 0120 0704 0000 0500 0000 0100 0000 ... ............ 00000140: 0000 0000 0200 0000 0800 0000 0b00 0000 ................ 00000150: 0600 0000 0400 0000 1000 0000 0e00 0000 ................ 00000160: 0a00 0000 0300 0000 0f00 0000 0c00 0000 ................ 00000170: 0700 0000 4d41 5353 4255 5300 3000 4441 ....MASSBUS.0.DA 00000180: 4947 4e4f 5354 4943 204d 4f44 4541 4241 IGNOSTIC MODEABA 00000190: 2f42 050f 0120 0d08 0f06 4d46 2043 5331 /B... ....MF CS1 000001a0: 0d18 1c08 0804 0f01 200d 2895 406c aa00 ........ .(.@l.. 000001b0: 0004 0f01 200d 2895 4082 aa00 0004 0f01 .... .(.@....... 000001c0: 200d 2895 4098 aa00 0004 0f01 200d 2895 .(.@....... .(. 000001d0: 40ae aa00 0004 0f01 200d 080f 054d 4620 @....... ....MF 000001e0: 4953 0d18 1c08 0804 0f01 200d 2895 40b2 IS........ .(.@. 000001f0: aa00 0004 0f01 200d 2895 40c8 aa00 0004 ...... .(.@.....
Proper binary dump of same sector to sector_dump.bin file:
sigrok-cli.exe -D -i samples\hdd_mfm_RQDX3_sector.sr -P mfm -B mfm=data > sector_dump.bin
Report of the first 17 sectors:
sigrok-cli -D -i samples\hdd_mfm_RQDX3.sr -P mfm:report=DAM:report_qty=17 -A mfm=reports
mfm-1: Summary: IAM=0, IDAM=17, DAM=17, DDAM=0, CRC_OK=34, CRC_err=0, EiPW=0, CkEr=0, OoTI=13/74987
Show all fields:
sigrok-cli -D -i samples\fdd_fm.sr -P mfm:data_rate=125000:encoding=FM:data_crc_size=16:data_crc_poly=0x1021 -A mfm=fields
mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=3, len=256 mfm-1: CRC OK A480 mfm-1: Sync pattern 5 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 9B8F mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=5, len=256 mfm-1: CRC OK E26 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK A730 mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=7, len=256 mfm-1: CRC OK 6844 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK F1F3 mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=9, len=256 mfm-1: CRC OK 4B4B mfm-1: Sync pattern 5 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 116E mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=2, len=256 mfm-1: CRC OK 97B1 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 3D09 mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=4, len=256 mfm-1: CRC OK 3D17 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 57A mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=6, len=256 mfm-1: CRC OK 5B75 mfm-1: Sync pattern 5 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK FB20 mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=8, len=256 mfm-1: CRC OK 787A mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK EEAC mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=10, len=256 mfm-1: CRC OK 1E18 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK CF39 mfm-1: Sync pattern 6 bytes mfm-1: Index Mark mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=1, len=256 mfm-1: CRC OK C2E2 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 219F mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=3, len=256 mfm-1: CRC OK A480 mfm-1: Sync pattern 5 bytes mfm-1: Data Address Mark mfm-1: Data Record mfm-1: CRC OK 9B8F mfm-1: Sync pattern 6 bytes mfm-1: ID Address Mark mfm-1: ID Record: cyl=0, sid=0, sec=5, len=256 mfm-1: CRC OK E26 mfm-1: Sync pattern 6 bytes mfm-1: Data Address Mark
Display just CRC fields, both good and bad, and nothing more:
sigrok-cli -D -i samples\hdd_mfm_RQDX3_sector.sr -P mfm:data_crc_poly_custom=0xbad -A mfm=crc:cre
mfm-1: CRC OK F38D mfm-1: CRC error 115E0390
Reverse engineering Header CRC using RevEng. You need to know Header size (3 or 4 bytes), size of Address Mark (OMTI8247 uses implicit A1 with standard FE) and CRC size (in this case 16 bits). CRC size can be deduced by looking at couple of Headers and comparing where CRC bytes start repeating. 'xxd -c' takes size of idcrc (A1 + FE + 4 bytes + 2 crc bytes), 'reveng -w' takes crc size in bits (16):
sigrok-cli -D -i samples\hdd_rll_OMTI8247.sr mfm:data_rate=7500000:format=RLL_OMTI:header_size=4 -B mfm=idcrc | xxd -p -c 8 | paste -sd' ' - | xargs ./reveng -w 16 -F -s
width=16 poly=0x1021 init=0x7107 refin=false refout=false xorout=0x0000 check=0xb623 residue=0x0000 name=(none)
Reverse engineering Data CRC using RevEng. You need to know Sector size (most likely 512), size of Address Mark (OMTI8247 uses implicit A1 with somewhat standard F8) and CRC size (in this case 48 bits). CRC size can be deduced by looking at couple of Headers and comparing where CRC bytes start repeating. 'xxd -c' takes size of datacrc (A1 + F8 + 512 bytes + 6 crc bytes), 'reveng -w' takes crc size in bits (48):
sigrok-cli -D -i samples\hdd_rll_OMTI8247.sr -P mfm:data_rate=7500000:format=RLL_OMTI:data_crc_size=48:sector_size=512 -B mfm=datacrc | xxd -p -c 520 | paste -sd' ' - | xargs ./reveng -w 48 -F -s
width=48 poly=0x181814503011 init=0x6062ebbf22b4 refin=false refout=false xorout=0x000000000000 check=0xc8c112fa414b residue=0x000000000000 name=(none)
We got lucky twice with this one! Above command shouldnt really work because
- RevEng demands at least four distict samples while hdd_rll_OMTI8247.sr containing Track 0: Cylinder 0, Head 0 has only three unique data CRCs (9E0686655A45 45321CB260F5 968B4351B496). Somehow RevEng guesses correctly as confirmed by scanning rest of full original OMTI-8247_RLL_820-6.tr hard drive image. If it failed we would have to find at least one more sector with different data CRC, quick scan of this disk dump has one at Track 611: Cylinder 101, Head 5 Sector 2 (A105DEE7B206).
- passing 26 sectors worth of hex encoded data is ~27000 characters. Windows has a 32767 character command line limit, but standard conhost only 8191 characters! It most likely worked for me because I use OpenConsole.exe renamed to conhost.exe. It ?should? also work in modern Linuxes (Bash ARG_MAX).
Fallback solution for Reverse engineering Data CRC using RevEng with temporary files:
sigrok-cli -D -i samples\hdd_rll_OMTI8247.sr -P mfm:data_rate=7500000:format=RLL_OMTI:data_crc_size=48:sector_size=512 -B mfm=datacrc | split -b 520 -d --additional-suffix=.bin - tmp_chunk_ & reveng.exe -w 48 -F -s -f tmp_chunk_.bin & rm tmp_chunk_.bin
General structure of arguments:
sigrok-cli -D -I csv:logic_channels=3:column_formats=t,l,l,l -i YourHugeSlow.csv -P mfm:option1=value1:option2=value2 -A mfm=annotation1:annotation2 -B mfm=binaryoutput3
Copy "mfm" subfolder to one of
- C:\Program Files\sigrok\sigrok-cli\share\libsigrokdecode\decoders
- C:\Program Files (x86)\sigrok\sigrok-cli\share\libsigrokdecode\decoders
- C:\Program Files\sigrok\PulseView\share\libsigrokdecode\decoders
- C:\Program Files (x86)\sigrok\PulseView\share\libsigrokdecode\decoders
- C:\Program Files\DSView\decoders
- your linuxy/mac location
or add SIGROKDECODE_DIR environment variable. Old user instructions are in documentation
- 0x1021 x16 + x12 + x5 + 1. Good old CRC-CCITT.
- 0xA00805 x32 + x23 + x21 + x11 + x2 + 1. Used by SMSC/SMC HDC9224 in VAXstation 2000 ("VAXSTAR" ). It just so happens to be an official CRC32 algorithm of CCSDS (Consultative Committee for Space Data Systems) used in Proximity-1 Space Link Protocol. Thats right - the one place that hasn't been corrupted by capitalism: SPACE!
- 0x140a0445 X32 + X28 + X26 + X19 + X17 + X10 + X6 + X2 + 1 WD1003/WD1006/WD1100 CRC32
- 0x41044185 x32 + x30 + x24 + x18 + x14 + x8 + x7 + x2 + 1 (init 0) Seagate ST11/21 header/data CRC32
- 0x140a0445000101 X56 + X52 + X50 + X43 + X41 + X34 + X30 + X26 + X24 + X8 + 1 WD40C22/etc ECC56
- 0x1021 (init 0x7107) OMTI 8247 CRC16
- 0x181814503011 (init 0x6062ebbf22b4) OMTI 8247 ECC48
- 0x0104c981 x32 + x24 + x18 + x15 + x14 + x11 + x8 + x7 + 1 (init 0x2605fb9c) OMTI 8240/5510 header CRC32
- 0x0104c981 x32 + x24 + x18 + x15 + x14 + x11 + x8 + x7 + 1 (init 0xd4d7ca20) OMTI 8240/5510 data CRC32
- 0x181814503011 (init 0x010000000000) Adaptec ECC48
- OMTI_5510_Apr85.pdf: ?0x40c99041 x32 + x31 + x24 + x23 + x20 + x17 + x16 + x13 + x7 + 1?
- 1983_Western_Digital_Components_Catalog.pdf WD1100-06 most likely typos claiming:
- ? 0x140a0405 X32 + X28 + X26 + X19 + X17 + X10 + X2 + 1
- ? 0x140a0444 X32 + X28 + X26 + X19 + X17 + X10 + X6 + X2 + 0
Lets start with easy one, standard CRC-CCITT x16 + x12 + x5 + 1. This CRC-CCITT polynomial can also be written as x16 + x12 + x5 + x0 because any (non-zero number)^0 is 1. We will use that second representation.
- Write 1 in position of every X, becomes 0b10001000000100001 (0x11021)
- Drop most significant bit, becomes 0b1000000100001 (0x1021)
- Thats it, you now have 0x1021 hex representation, its that easy.
Now try CRC32-CCSDS x32 + x23 + x21 + x11 + x2 + 1
- Write 1 in position of every X, becomes 0b10000000101000000000100000000101 (0x80A00805)
- Drop most significant bit, becomes 0b101000000000100000000101 (0xA00805)
- 0xA00805, done!
- CRC RevEng: arbitrary-precision CRC calculator and algorithm finder by Greg Cook
- CRC Calculator (Javascript) Set custom CRC-16/32 with appropriately sized initial value 0xFFFF/0xFFFFFFFF. Dont forget to prepend ID/Data Mark bytes (FE, A1FE, A1A1A1FE what have you) to your data.
- Online CRC Calculation Cyclic Redundancy Check (CRC) Step-by-Step Calculator Useful for converting binary Polynomial to x^ notation.
- Thierry Nouspikel The TI floppy disk controller card Award winning resouce on FM/MFM modulation and floppy encoding schemes.
- Wouter Vermaelen Low-level disk storage
- Michael Haardt, Alain Knaff, David C. Niemi The floppy user guide
- Hard Disk Geometry and Low-Level Data Structures by School of Electrical and Computer Engineering of Applied Studies in Belgrade (VISER)
- Artem Rubtsov (creator of HDDScan) HDD from Inside: Hard Drive Main Parts HDD inside: Tracks and Zones
- Bit Banging a 3.5" Floppy Drive
- Logic analyzer: visualizing latency between two digital signals in real time with sigrok and matplotlib
- US3794987 Mfm readout with assymetrical data window
- US5062011A Address mark generating method and its circuit in a data memory
- SMC HDC9224 Universal Disk Controller (MFM)
- WD1100-06 (MFM)
- WD10C22B Self-Adjusting Data Separator (MFM/RLL)
- WD42C22A Winchester Disk Subsystem Controller (MFM/RLL/NRZ)
- WD50C12 Winchester Disk Controller (MFM/RLL/NRZ)
- Adaptec AIC-270 2,7 RLL Endec
- Adaptec AIC-6225 33-Mbit/second (1,7 RLL) Data Separator. Datasheet missing.
- Adaptec AIC-6060 Storage Controller pin and function compatible with Cirrus Logic CL-SH260
- Cirrus Logic CL-SH260
- SSI 32D534 Data Synchronizer/MFM Endec in 1989_Silicon_Systems_Microperipheral_Products (page 271)
- SSI 32D5321/5322, 32D535/5351, 32D5362 2,7 RLL Endec
- National Semiconductor DP8463B 2,7 RLL Endec (2-85)
- OMTI 5070 MFM Data Seperator
- OMTI 5027C 2,7 RLL Endec
- OMTI 7xX0/3500
WD1003V versions have 2KB buffer, WD1006V 8KB. Afaik MM1/2 and SM1/2 is same base hardware with minor component configuration differences (crystals). SR1/2 adds Option ROM with shadowing SRAM and most likely different microcontroller firmware for RLL support. The only reason those MM/SM models didnt support RLL was WD playing market segmentation games.
- Herb Johnson "Classic" hard drives: controllers, cabinets, disks, docs & hints
- Arnold0 - Arnlol Youtube channel Retro hard drives collector. Tons of videos showing tests, internals and impressive hardware fixes like swapping heads and platters!
- Help with HDD data encoding puzzle: RLL or ... what? (Iomega Alpha-10 / 10H / 20 proprietary RLL(1,8) 2/3 RLLC)
- David Gesswein BeagleBone based MFM Hard Disk Reader/Emulator/github
- Tronix286 Pi Pico MFM Hard Disk Dumper
- Matt Jenkins Pi Pico based MFM Hard Disk Emulator early work in progress
Original project by David C. Wiens: https://www.sardis-technologies.com/ufdr/pulseview.htm
Matt Jenkins Majenko Technologies (3byte headers, hard drive support, optional channels, DSView support)
Rasz_pl
Full Changelog. Biggest changes from original:
- Modern PulseView and sigrok-cli fixes
- DSView support
- Hard drives, 32 bit CRC, 48/56 bit ECC, custom polynomials
- New PI Loop Filter based PLL Decoder
- Flexible
custommode with live GUI controls allowing decoding new formats without touching the code. - RLL support
- RLL decoding
- more Test samples
- annotate reason of PLL reset
- dont reset PLL on data decode error
- try to recover with ECC
- Binary Output
- Support more Header formats
- more
automodes-
autodata_rate detection -
autosector_size mode using Sector length value from the Header -
autoheader_bytes detection -
autoCRC modes-
autoheader_crc_size detection -
autoheader_crc_poly/header_crc_init detection -
autodata_crc_size detection -
autodata_crc_poly/data_crc_init detection
-
-
autoencoding detection - this is a difficult one
-
- Rename Errors annotation field to more general Status
- Figure out crazy RLL_DTC7287 format
- use RevEng to reverse all crc/ecc
- GCR
- ESDI?
- SMD??? :-)