Re: Copying USB stick fails with device errors

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On 6/7/2012 8:24 PM, Alex wrote:
> Hi,
> 
>>> I believe the problem is that the filesystem starts at block 4 and not
>>> at the beginning, so mount can't figure out how to mount it.
>>
>> Use an offset, e.g.
>>
>> # mount -o loop,offset=4 ....
> 
> Thanks, I should have thought of that. Alas, it didn't work.
> 
> # mount -o loop,offset=4 -t vfat myusb_sdb.dd /media/desktop/
> mount: wrong fs type, bad option, bad superblock on /dev/loop0,
>        missing codepage or helper program, or other error
>        In some cases useful info is found in syslog - try
>        dmesg | tail  or so
> 

I believe the offset is in bytes, not sectors.  If I'm right, then you need:
mount -o loop,offset=2048 -t vfat myusb_sdb.dd /media/desktop/
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