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picosonic / bbc-fdc

Floppy disk interface for Raspberry Pi
MIT License
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Read and recovery data from DMF floppy disk (2HD 1.7MB) - Enhancement #29

Open Maverick-Shark opened 3 years ago

Maverick-Shark commented 3 years ago

Hi, I have old 2HD floppy disk formatted to 1.7MB (DMF). Please, could you add this feature (read tracks 81 and 82)? Thanks,

picosonic commented 3 years ago

Can you capture one of the disks in .RFI format and send it to me to check?

You can already capture more than 80 tracks using the -tmax parameter (remember tracks are 0 based)

When I looked up DMF format, it appeared to be a standard format, just with 21 sectors/track and 82 tracks.

I suggest you test your drive using drivetest to see what track number it is capable of stepping to

Thanks

picosonic commented 3 years ago

I have found a Microsoft Windows 95 setup boot disk which claims to be in High-Density (DMF) format.

It has the following meta data

512 bytes/sector 1 sectors/cluster 1 reserved sector 224 root entries 2800 sectors on volume (small) media type f0 [2.88MB 3.5-inch, 2-sided, 80-track, 36-sector or 1.44MB 3.5-inch, 2-sided, 80-track, 18-sector] 9 sectors/fat 18 sectors/track 2 heads 0 hidden sectors signature 29 volume id serial 2371-1907 volume label "NO NAME " system id "FAT12 "

WIN_OPK 28 W--VFA 00 09:58:30 31/03/1997 IO.SYS 20 W---FA 00 11:11:10 24/08/1996 @ 0x0002 -> 4200 214836 bytes MSDOS.SYS 20 W---FA 00 11:11:10 24/08/1996 @ 0x01a6 -> 38a00 7 bytes COMMAND.COM 20 W---FA 00 11:11:10 24/08/1996 @ 0x01a7 -> 38c00 93812 bytes ?AISATAP.SYS 20 W---FA 00 16:37:00 12/12/1996 @ 0x025f -> 4fc00 17961 bytes autoexec.bat 20 W---FA 00 14:45:32 16/05/1997 @ 0x025f -> 4fc00 1362 bytes

bbc-fdc is able to extract the whole disk fine

18 x 512 byte sectors per track * 80 tracks on 2 sides = 1.44Mb so perhaps not really DMF

Maverick-Shark commented 3 years ago

I'll try it. Thanks,

picosonic commented 2 years ago

Hi, just following up on this, how did you get on?