Hard help needed

my backup HD is current displaying 94MB available. it's a 120gig drive, how do make it read the entire drive as /backup

root@nmx [/]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda3 110G 11G 93G 11% /
/dev/hda1 487M 19M 443M 5% /boot
none 1007M 0 1007M 0% /dev/shm
/dev/hdb1 99M 13K 94M 1% /backup

 

 

 

 

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