I *THINK* (and am probably wrong) that it is a marketing issue. Some companies will brand hard drives with 160,000 megs as 160 gigs. But there are really 1,024 megs in a gig, not a flat 1,000, so that consumes some of those missing megs. Additionally, depending upon the file system you choose for the partition, you are using up megs to store file info (NTFS in particular, I believe?)
Take what I say with a grain of salt. I am really not sure ...
cscgal
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