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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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 Posted: Sat Feb 11, 2006 9:41 pm Post subject: [SOLVED] dd if=/dev/zero of=/dev/fd0 bs=1k count=1440 error |
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I'm trying to copy an image of smart boot manager to a floppy using dd from coreutils 5.93, but it won't work.
So I tried to just zero every bit of the whole floppy, but it won't work.
I figured it was a bad floppy and switched to another, almost never used before floppy, but it won't work.
I do:
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dd if=/dev/zero of=/dev/fd0 bs=1k count=1440
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and get
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dd: skriver "/dev/fd0": In/ut-fel
1+0 poster in
0+0 poster ut
0 byte (0 B) kopierade, 1,24379 sekunder, 0,0 kB/s
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and my dmesg gives me:
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floppy0: data CRC error: track 0, head 0, sector 1, size 2
floppy0: data CRC error: track 0, head 0, sector 1, size 2
end_request: I/O error, dev fd0, sector 0
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Why? What am I missing? These floppies have worked before!
Last edited by psy_ill on Tue Feb 14, 2006 1:07 am; edited 1 time in total |
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Aysen
Apprentice
Joined: 18 May 2005
Posts: 187
Location: Poland
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| Posted: Sat Feb 11, 2006 9:52 pm Post subject: |
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| Any chance that permissions on /dev/fd0 are screwed up? Although, looking at that dmesg, it's probably something else... |
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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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| Posted: Sat Feb 11, 2006 9:57 pm Post subject: |
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Nothing wrong with my permissions.
Btw, I have tried doing the dd thing as root too.
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$ ls /dev/fd0
lrwxrwxrwx 1 root root 8 12 feb 00.04 /dev/fd0 -> floppy/0
$ ls /dev/floppy/0
brw-rw---- 1 root floppy 2, 0 12 feb 00.04 /dev/floppy/0
$ groups
foo floppy bar
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sge_kane
Tux's lil' helper
Joined: 10 Oct 2004
Posts: 84
Location: Germany (Frankfurt)
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| Posted: Sat Feb 11, 2006 10:16 pm Post subject: |
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What if you choose to use
instead of your bs=1k and omit that count option....
Cheers |
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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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| Posted: Sat Feb 11, 2006 10:27 pm Post subject: |
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Ok, I get a new error:
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$ dd if=/dev/zero of=/dev/fd0 bs=2x80x18b
dd: skriver "/dev/fd0": Enheten är full
1+0 poster in
0+0 poster ut
4096 byte (4,1 kB) kopierade, 1,06633 sekunder, 3,8 kB/s
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Allow me to translate :)
dd: writing "/dev/fd0": unit is full
dmesg:
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floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
floppy0: probe failed...
end_request: I/O error, dev fd0, sector 0
floppy0: fractionary current count b=0 s=0
addr=0, length=0
st=0 ast=0 mse=16 msi=8
ssize=10 SIZECODE=6
command=c5 SECTOR=1 HEAD=0, TRACK=0
buffer drive=0
buffer track=0
buffer_min=0
buffer_max=8
end_request: I/O error, dev fd0, sector 0
Buffer I/O error on device fd0, logical block 0
lost page write due to I/O error on fd0
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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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| Posted: Sat Feb 11, 2006 10:49 pm Post subject: |
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I have tried various ways of loading the floppy module, to avoid any potentially dangerous operations.
Still no luck. I guess I will have to check the floppy cable once more and then I will probably have to find a new FDD. |
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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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| Posted: Tue Feb 14, 2006 12:27 am Post subject: |
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News, bad news:
I checked the cable and it looked ok.
I got the crazy idea of booting a win98-dos-boot-floppy-cd to test if ms-dos 7.1 was able to do something useful with the floppy.
I ran
(the fake boot floppy on the cd was given the letter a, hence the b)
and I got a formatted floppy and
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1,457,664 bytes total disk space
27,648 bytes in bad sectors
1,430,016 bytes available
512 bytes in every allocation unit
2,793 allocation units available
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Apparantly, the drive was working just fine.
I can now mount the floppy back in Gentoo using the vfat filesystem.
I can do this too:
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# mkfs.ext2 /dev/fd0
mke2fs 1.36 (05-Feb-2005)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
184 inodes, 1440 blocks
72 blocks (5.00%) reserved for the super user
First data block=1
1 block group
8192 blocks per group, 8192 fragments per group
184 inodes per group
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
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and then mount the floppy.
All of a sudden, dd starts working again:
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$ dd if=sbootmgr.dsk of=/dev/fd0
216+0 poster in
216+0 poster ut
110592 byte (111 kB) kopierade, 7,5805 sekunder, 14,6 kB/s
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Of course, there are some problems with the bad blocks, but it is still a better result compared to my previous attempts:
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$ dd if=/dev/zero of=/dev/fd0 bs=512 count=2880
dd: skriver "/dev/fd0": In/ut-fel
2593+0 poster in
2592+0 poster ut
1327104 byte (1,3 MB) kopierade, 106,924 sekunder, 12,4 kB/s
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In this last case, dmesg | tail gives me:
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floppy0: data CRC error: track 72, head 0, sector 4, size 2
floppy0: data CRC error: track 72, head 0, sector 4, size 2
end_request: I/O error, dev fd0, sector 2595
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which means that some of the tracks have been mysteriously repaired, dd doesn't choke on the first track anymore!
What magic did ms-dos do and how do I make Gentoo Linux do the same trick? |
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psy_ill
Tux's lil' helper
Joined: 06 Jul 2003
Posts: 106
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| Posted: Tue Feb 14, 2006 1:06 am Post subject: |
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Aha! I think I've found it!
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$ fdformat /dev/floppy/0
Dubbelsidig, 80 spår, 18 sektorer/spår. Total kapacitet 1440 kB.
Formaterar... klar
Verifierar... klar
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After that, everything worked like a charm:
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$ dd if=resc1440-safe.bin of=/dev/fd0 bs=1b
2880+0 poster in
2880+0 poster ut
1474560 byte (1,5 MB) kopierade, 102,153 sekunder, 14,4 kB/s
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fdformat did the magic! I now have a beautiful old boot floppy for Debian Slink with a 2.1.12 kernel, which (hopefully) will boot my friend's IBM Aptiva, which gets kernel panic when using a kernel after 2.2.20... |
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