size from df -kh vs size from fdisk -l

[jackson byers]

I asked this questiion in another thread
"f10 liveinstall cd trashed my main fc5"

but i think it got lost in my longish  msg

# 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

how possible?
advice, help on further  diagnosing this?
Jack
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