size from df -kh vs size from fdisk -l

[Andrew Parker]

On Tue, Apr 21, 2009 at 8:37 AM, jackson byers <byersjab at gmail.com> wrote:
> # fdisk -l
>
> Disk /dev/sda: 36.7 GB, 36703934464 bytes
> 255 heads, 63 sectors/track, 4462 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *           1        2676    21494938+  83  Linux
> /dev/sda2            2677        3163     3911827+  82  Linux swap / Solaris
> /dev/sda3            3164        4462    10434217+  83  Linux
>
> sda1 size  ~ 21.5 G
>
> but using df:
> # df -kh
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sdb6             7.7G  5.6G  1.8G  77% /
> tmpfs                1014M     0 1014M   0% /dev/shm
> /dev/sda1             190M  5.6M  175M   4% /mnt/sda1
>
> sda1 size = 190M

df comes from the file system rather than the partition.  is it
possible that the sda1 partition was resized but not reformatted?

if you can stand to lose the data, can you reformat the file system?
do you then get the expected size?