Re-partition USB key

[Antonio T. Sun]

On Wed, 09 Sep 2009 22:24:19 +0000, Antonio T. Sun wrote:

> Hi,
> 
> I re-partitioned my USB key using gparted, but I'm having a hard time
> trying to make my mount know the changes.
> 
> This is what it was before:
> 
>   $ sfdisk -l -uM
> 
>   Disk /dev/sdb: 499 cylinders, 255 heads, 63 sectors/track Units =
>   mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from
> 0
> 
>      Device Boot Start   End    MiB    #blocks   Id  System
>   /dev/sdb1         0+   807-   808-    827316    6  FAT16 /dev/sdb2   *
>     807+  1796-   989-   1012095   83  Linux /dev/sdb3      1796+  2784-
>     989-   1012095   83  Linux /dev/sdb4      2784+  3914-  1130-  
>   1156680   83  Linux
> 
> This is what it is now:
> 
>   $ sfdisk -l -uM /dev/sdb
> 
>   Disk /dev/sdb: 499 cylinders, 255 heads, 63 sectors/track Units =
>   mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from
> 0
> 
>      Device Boot Start   End    MiB    #blocks   Id  System
>   /dev/sdb1         0+   807-   808-    827316    6  FAT16 /dev/sdb2   *
>     807+  3208-  2401-   2457945   83  Linux /dev/sdb3      3208+  3914-
>     706-    722925   83  Linux /dev/sdb4         0      -      0        
>    0    0  Empty
> 
> Now watch:
> 
>   % mount /dev/sdb2 /mnt/tmp2/
> 
>   $ df | grep sdb
>   /dev/sdb2               996148      1464    944080   1% /mnt/tmp2
> 
>   % umount /dev/sdb2
> 
>   $ sfdisk -V /dev/sdb
>   /dev/sdb: OK
> 
> I.e., when I mount the newly-changed 2G sdb2, 'mount' still gives me a
> 989M disk. I've unplugged and replugged the USB key several times, and
> even replugged to different USB port, but still NOK. Why?

Ah, found it. 

gparted used to format the created disks. For some reasons, it stops 
doing so, at least from the version that I'm using:

$ apt-cache policy gparted
gparted:
  Installed: 0.4.5-2
  Candidate: 0.4.5-2
 *** 0.4.5-2 0
        300 http://debian.mirror.rafal.ca testing/main Packages
        100 /var/lib/dpkg/status

Using mkfs.ext2 to format the created disk (/dev/sdb2) solve the problem.

Antonio

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