Thank you Ryusuke for the quick reply

Of course dmesg is the first thing I looked at.
All I see is a not very informative message
> NILFS: Can't find nilfs on dev sdc.


On Sun, Dec 4, 2011 at 3:29 PM, Ryusuke Konishi
<[email protected]> wrote:
> Hi,
> On Sun, 4 Dec 2011 11:10:12 +0200, Zavi wrote:
>> Hi all,
>>
>> I'm trying yo mount nilfs on a device without success.
>> mkfs works just fine, but when I try to mount I keep getting an error
>> > sudo mkfs -t nilfs2 /dev/sdc
>> > sudo mount -t nilfs2 /dev/sdc ~/nilfs
>> mount.nilfs2: Error while mounting /dev/sdc on ~/nilfs: Invalid argument
>>
>
> Were there any related messages in logs?  Please try dmesg command or
> make sure system logs:
>
>  $ dmesg
>
>  or
>
>  $ sudo cat /var/log/{messages,syslog}
>
> Regards,
> Ryusuke Konishi
>
>> I've installed nilfs-utils, and this is what I get from fsck
>> > sudo fsck0.nilfs2 -f -v /dev/sdc
>> fsck0.nilfs2: cannot read super block (device=/dev/sdc)
>>
>> just to be sure the problem is not in the device, I mounted ext4 on it
>> successfuly.
>> I can also do block requests (dd, iometer) without a problem.
>>
>> I'd appreciate any suggestion.
>>
>> Thanks,
>> Zavi
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