You need a registry setting to enable LBA48, otherwise you'll end up with a corrupted filesystem, unless you use normal Windows to partition and format, in which case you'll only get 137Gb. Don't remember which setting, but it has been mentioned here before, so you should be able to find it.

Edit: Ah, here they are: How to Enable 48-bit Logical Block Addressing Support for ATAPI Disk Drives in Windows 2000 and How to Enable 48-bit Logical Block Addressing Support for ATAPI Disk Drives in Windows XP

Stig