where’s the drive space

I feel I should know this, but can’t remember.

I have a Quantum 30Gb HDU which is recognized by the BIOS as such. The unit has a single 30Gb partition, as reported by both Fdisk and PartitionMagic. But the OS sees only 20Gb.

What am I overlooking. The drive has been configured FAT32 on a WinME system.

I have installed the unit into my XP machine for test and analysis. CHKDSK reports only 20Gb as does TreeSize and Windows Explorer.

Please, any clues.

Paul