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    Subject2.4.18: filesystem corruption on harddisk when bad sectors on floppydisk (!)
    Date
    Hi,

    When I read from a floppy disk with badsectors and write to a file
    on the harddisk, I get filesystem corruption. Filesystem on hard-
    disk is ext3. I'm reading the floppy in raw mode (open("/dev/fd0"
    etc.).
    In dmesg I get:
    floppy0: data CRC error: track 32, head 1, sector 7, size 2
    floppy0: data CRC error: track 32, head 1, sector 7, size 2
    end_request: I/O error, dev 02:00 (floppy), sector 1176
    and suddenly the write fails with 22. The file attributes are
    suddenly weird:
    -rwxr-Sr-T 1 root root 602112 Jan 3 00:50 ../test
    Nothing in the logs.
    Kernel version is 2.4.18.
    Harddisk is on IDE:
    ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    PIIX4: IDE controller on PCI bus 00 dev 21
    PIIX4: chipset revision 1
    PIIX4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0xd800-0xd807, BIOS settings: hda:DMA, hdb:pio
    hda: ST320413A, ATA DISK drive
    ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
    No fiddling with hdparm or whatsoever.


    Folkert van Heusden

    p.s. the rather trivial program I used can be found at:
    http://www.vanheusden.com/Linux/recoverdm-0.1.tgz
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