External hard drive said it had 320gb but computer said it only had 298 why?

Answer Hardware on the drive isn't quite 320, they round up to the nearest gig. Software also takes up some space such as drivers that make it compatible with computer systems.

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Why does my Seagate GoFlex Desk External Hard Drive 2TB 3.0 USB only show a capacity of a 160 GB?

If you have access to windows machine, have a look at it in disk management, any hidden partitions should be obvious, if nothing shows you been done dude

Can I use any external hard drive for my desktop computer?

The external drive that you have chosen will work just fine. All you do is just plug in the power card, then plug in the USB cord to your computer.Good Luck