You bought the MiniStation?
It is USB 1.1, comes pre-formatted but their data sheet does not say what the format is.
Since it's 250 GB I am going to assume it's not FAT32 as FAT32 does not support partitions largest than 38 gb's. To use the full 250 it would have 6 32 gb partitions. Meaning it would show up as 6 discs, not one.
Just checked and ME does not support NTFS, only FAT partitions.
So it looks like you either need to upgrade to XP, (doubt the box will handle Vista) or create 6 32 gb partitions on the drive, (ugh).
http://www.ntfs.com/ntfs_vs_fat.htm