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jel
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Joined: 10 Aug 2005
Posts: 259
Location: Gothenburg
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 Posted: Mon Dec 25, 2006 11:25 am Post subject: File system corruption on a USB drive (mp3 player) [SOLVED] |
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I have a problem with my 1GB vfat drive. It seems like the disk buffer is not properly flushed on unmount so the filesystem is in an inconsistent state when I physically remove the drive. I have tried sync && umount /mnt/stick, but that still doesn't help. This was after copying a 500MB mp3 file using copy&paste in GNOME nautilus.
Additionally, I have found that mkfs.vfat does not properly reformat the drive; the mp3 player won't recognize the file system. I suppose the mp3 player does not implement vfat correctly. Luckily I have two of these mp3 players so I managed to copy the raw blocks from the other, empty, drive using dd.
These are the options in fstab. The mount point is shared with a USB stick, hence the name.
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# USB stick
/dev/sda1 /mnt/stick vfat defaults,user,uid=1000,gid=100 0 0
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dd just finished reconstructing the empty file system so I'm going to try copying the mp3 using cp.
Last edited by jel on Wed Dec 27, 2006 10:12 am; edited 1 time in total |
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jel
Apprentice
Joined: 10 Aug 2005
Posts: 259
Location: Gothenburg
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| Posted: Mon Dec 25, 2006 11:46 am Post subject: Re: File system corruption on a USB drive (mp3 player) |
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dd just finished reconstructing the empty file system so I'm going to try copying the mp3 using cp. |
After cp, unmount and waiting for the write indication to stop, unplugging, replugging and remounting; file does not show up, but the usage is ~500 MB. Running dd again... |
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jel
Apprentice
Joined: 10 Aug 2005
Posts: 259
Location: Gothenburg
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| Posted: Mon Dec 25, 2006 1:56 pm Post subject: Re: File system corruption on a USB drive (mp3 player) |
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Just thinking, maybe the file length descriptor exceeds some max number of bits. The byte size of 512 MB is 39 bits, perhaps the blocks/sectors counter exceeds 31 bits..? I have successfully transferred files up to 200-300 MB to the drive, perhaps there's a threshold at 512 MB...
I'm using mp3splt to split the mp3 into 100 minute files to see if that'll work. |
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jel
Apprentice
Joined: 10 Aug 2005
Posts: 259
Location: Gothenburg
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| Posted: Wed Dec 27, 2006 10:11 am Post subject: Re: File system corruption on a USB drive (mp3 player) |
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| jel wrote: |
I'm using mp3splt to split the mp3 into 100 minute files to see if that'll work. |
That worked. Guess the file size limit on the drive is 512 MB then. |
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