Re-partition USB key

[Antonio T. Sun]

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?

How can I fix it? 

Thanks


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