df -h not showing disk space

[BC]

Ok this seems weird to me. I have had FC3 installed and running now for
3 months with no problems or even a reboot :-) But I just noticed my /
partion is getting full. Only trouble is is that it only shows it is a
39GB partition but really it is 74GB. Anyone see this before ? It is a
problem with df only showing 39GB it Is a SATA drive so the one I need
help with is /dev/sda.

df -h 

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1              39G   24G   13G  66% /   
<-------------------------------
/dev/hdb1             151G   25G  119G  18% /Storage
none                  506M     0  506M   0% /dev/shm
/dev/hda1              92G   21G   67G  24% /VirtualMachines

fdisk /dev/sda 

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        9601    77120001   83  Linux
<---------------------------
/dev/sda2            9602        9729     1028160    5  Extended
/dev/sda5            9602        9729     1028128+  82  Linux swap


dmesg 
scsi1 : sata_sil
ata2: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003
88:207f
ata2: dev 0 ATA, max UDMA/133, 156301488 sectors: lba48
ata2: dev 0 configured for UDMA/100
scsi2 : sata_sil
  Vendor: ATA       Model: ST380013AS        Rev: 3.05
  Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
SCSI device sda: drive cache: write back
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
SCSI device sda: drive cache: write back
 sda: sda1 sda2 < sda5 >
Attached scsi disk sda at scsi2, channel 0, id 0, lun 0
SELinux: initialized (dev sda1, type ext3), uses xattr
EXT3 FS on sda1, internal journal
Adding 1028120k swap on /dev/sda5.  Priority:-1 extents:1


WEBMIN :

Location 	SCSI device A
Cylinders 	9729
Size 	75 GB
Model 	ATA ST380013AS
Controller 	2
Target 	0
	
No. 	Type 	Extent 	Start 	End 	Use 	Free
1 	Linux 		1 	9601 	/ 	33 %
2 	Extended 		9602 	9729 		
5 	Linux swap 		9602 	9729 	swap 	
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