The way manufacturers count GB and the way computers count GB are different.
to a manufacturer, 1GB = 1,000,000,000 bytes
to a computer, 1GB = 1,073,741,824 bytes
this is because computers use binary, which is base 2 instead of decimal which is base 10
in short, every 640GB HD is that same exact size, so you should not return or exchange it.
That is normal. If you look at the fine print on almost every hard drive packaging they define a gigabyte as 1,000,000,000 bytes (or some other multiple such as 1,000,000 KB) when in reality it is 1,073,741,824 bytes. Doing the math shows that drive unformatted would show about 605 GB. Also formating the drive does take up some of the space which is sometimes called overhead. so 50 gigs is totally plausible.
That sounds abnormal but here is how to see. Plug the disk into computer and make sure that it registers. In windows right click on my computer or computer in windows 7 and select manage then select disk management. This will show you the hard drive and it partitions. You will be able to see the partitioned drive here make sure that it is occupying the whole disk. If not format the disk by right clicking the drive and selecting format i would go with ntfs file system. It is not uncommon for the disk to be smaller but not 50 gig. if the format doesn't fix it take it back.
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