Very easy one - until Windows 2000 Service Pack 4, Microsoft couldn't handle IDE drives larger than 137Gb.
In SP4 they included a registry tweak that solves the problem - full details can be found at http://support.microsoft.com/default.aspx?scid=kb;en-us;305098
This only affects IDE Drives connected directly to the motherboard (ATAPI) - if you have a RAID Card then this usually doesn't affect you as the RAID card uses it's own driver instead.
Peter Jarrett, Technical Director
Broadcast Radio Ltd.
Bill Bailey: No win, no fee, no basis in reality. Just a room above a minicab office in Acton and a steady stream of greedy simpletons whose delusion is only matched by their clumsiness