No space left on device

I try to execute this command, and…

phoenix:/export/backups/controle/200912 # bzip2 bkpbd_eti-200912061300.tar
bzip2: I/O or other error, bailing out. Possible reason follows.
bzip2: No space left on device
Input file = bkpbd_eti-200912061300.tar, output file = bkpbd_eti-200912061300.tar.bz2
bzip2: Deleting output file bkpbd_eti-200912061300.tar.bz2, if it exists.

But… my df -h command say: (I am on /dev/sdb1)

phoenix:/export/backups/controle/200912 # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 81G 13G 68G 16% /
udev 991M 92K 991M 1% /dev
/dev/sdb1 233G 95G 139G 41% /export
/dev/sda3 26G 19G 6.1G 76% /home
/dev/sda2 121G 80G 41G 67% /var

So… What is wrong? I didn´t find large deleted files. How do i proceed to clean trash space on OpenSuse 10.2 ?? or solve this problem (mistake?!) Thanks in advance.