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Date: Thu, 18 Jan 2007 16:41:45 +0200 (EET)
Subject: Re: PROBLEM: writting files > 100 MB in FAT32
From: "Condor" <condor@stz-bg.com>
To: "Kasper Sandberg" <lkml@metanurb.dk>
Cc: linux-kernel@vger.kernel.org
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> On Thu, 2007-01-18 at 11:22 +0200, Condor wrote:
>> Hello,
>>
>> [1.] Files if > 100 MB saving in USB memory stick 4 GB with FAT32. While
>> saving all files is broken.
> im sorry, i do not understand this.
>
> you are saying that if you copy files larger than 100mb into drive, all
> files die?

No, only file when i copy is die.

>
>> [2.] I have USB memory stick A-DATA 4 GB with FAT32. When i trying to
>> save
>> files in my USB and files is > of 100 MB, all files that i save is
>> broken.
>> I put my USB in my laptop and mount it as: mount /dev/sda1 /mnt/usb-win
>> While i mount it, i got in my local disk and copy one file that is 520
>> MB.
>> The file is copying very slow (10 min). and after i see again my console
>> i
>> wait light to my usb is off and i unmount it as: umount /mnt/usb-win
>> I get my USB stick and when i return to home i trying to copy file from
>> my
>> USB to my windows and linux. Both OS unable to read file.
>> After some tryings i format my USB in FAT16 and now every thing is work
>> fine. I copy files to my USB and back to my hard drive and all files
>> work
>> fine.
>
> okay, i think thats what you are saying, could you please try to run
> dosfsck on it so we can see 100% whats wrong?
>

Yes, i run and it found error, i also run in windows scan drive, also
found errors. I't correct them and i make test again. After copy file
(unmount, sync ... ) i insert adapter again in windows and again unable to
copy file from usb to windows (linux say may be missing sectors, mount it
with read-only), run scan drive from windows and windows again found lost
sectors.

> also, try to do this:
> mount, copy, run command 'sync', unmount, pull out, and see if it works.
>

Yes this is that i make.

> finally, one more question. you said it does not work when you take it
> home, can you try this: mount, copy, unmount, mount, check to see if
> file works.
>

Yes i try one of the times and linux say may be sda1 have missing sectors
mount it with read-only.

>
>> [3.] lsmod
>> # lsmod
> <snip>
>> nvidia               4709172  22
> ohh, tainted ;P naughty. Though i dont think this affects vfat.
> <snip>
>
>> Regards,
>> Condor
>>
>> -
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>>
>
>

I no longer can make tests because i remove my fat32 from my usb stick and
i put it in to FAT16 and i make the exact tests and file is worked but on
fat16 not in fat32. I just report the problem, to be investigate from
kernel developers.


Regards,
Condor

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