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Thread: reading single-sided format floppies in a PC with a 5.25 inch 1.2 Mbyte drive?

  1. #21
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    Default

    Glad I could help.

  2. #22
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    Also, for future seekers, I now can confirm that fdcontrol parameters for ND (Norsk Data) format 0b:
    Code:
    fdcontrol -s 8,512,0xff,40,77,500,1,80,0,0,-mfm /dev/fd0
    and 17b:
    Code:
    fdcontrol -f 1232 /dev/fd0
    works equally well for an 8-inch floppy drive connected to a PC via a FDADAP (straight cables on both sides of the FDADAP).
    I am now happily reading my stash of Nd format 8 inch floppies.

    Norsk Data floppy formats: http://www.ndwiki.org/wiki/ND_floppy_disks
    Last edited by tingo; July 4th, 2018 at 03:24 PM. Reason: corrected a spelling error
    Torfinn

  3. #23
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    Default writing also works

    Just to confirm that writing also works. Steps are as follows:
    Set controller to correct format
    Code:
    root@kg-t2# fdcontrol -s 8,512,0xff,40,77,500,1,80,0,0,-mfm /dev/fd1
    verify
    Code:
    root@kg-t2# fdcontrol -vF /dev/fd1
    /dev/fd1: 308 KB media type
        Format:        8,512,0xff,0x28,77,500,1,0x50,0,0,+auto
        Sector size:    512
        Sectors/track:    8
        Heads/cylinder:    1
        Cylinders/disk:    77
        Transfer rate:    500 kbps
        Sector gap:    40
        Format gap:    80
        Interleave:    0
        Side offset:    0
        Flags        <AUTO>
    Format the floppy
    Code:
    root@kg-t2# fdformat -s 8,512,0xff,40,77,500,1,80,0,0,-mfm /dev/fd1
    Format 308K floppy `/dev/fd1'? (y/n): y
    Processing VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV done.
    for some reason the format of the floppy controller changed back to default, so I had to set it again
    Code:
    root@kg-t2# fdcontrol -s 8,512,0xff,40,77,500,1,80,0,0,-mfm /dev/fd1
    then it is just to write the image to floppy with dd:
    Code:
    tingo@kg-t2$ sudo dd if=./2018/0326/ND-10005U.image of=/dev/fd1 bs=512
    616+0 records in
    616+0 records out
    315392 bytes transferred in 115.287074 secs (2736 bytes/sec)
    that's it.
    Torfinn

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