stickyb
NTServer will recognise about 10GB, but allowing for 'overhead', it'll settle around 8GB, the size it's detecting.
To fully utilise the disk, you will need to partition it using FDisk (if happy) or other software - perhaps dividing it 8/8/4 etc.
The other partitions can then be formatted through NT as NTFS (NT file system), and then you'll have your 20GB.
Partitioning is useful, because if you lose your OS, all other work etc. will be preserved on the other partitions :-)
Hope this helps a little.
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Me, sweat? I'm that cool, it's condensation.