What will make a computer hard drive thats a 80 GB drop to a 75 GB?

my computer repairman discovered today when he repartitioned my hard drive on my computer today 80GB that it has dropped to to a 75 GB he said that after he wiped off all the programs it was showing it was only a 10 GB DRIVE after he installed windows xp pro it showed it being a 75 GB hard drive what will cause a hard drive to do this and how can i get it fixed ( is my hard drive going out ? ) thanks for any advise

Answers:
This is from a previous question like this:
I would probably guess the reason for this is because vendors usually sell hard drives with the metric that a gigabyte is 1 billion bytes when in reality it is actually 2^30 bytes (1,073,741,824 bytes). So in your case the company that sells the hard drive says its 80 gigabytes which with their metric is exactly 80 billion bytes but the actual amount of disk space when measured on your computer will be less because it uses the correct metric for a gigabyte (80 billion / 2^30 = real disk space). They say 80 GB but its really like 74 point something gigs. Almost all hard drive vendors do this any more so that they can sell it as having more space than it actually does. Hope this helps and isn't too technical.
dude when the hard drive is formatted it takes up a certain amount, your hard drive is actually 5-10% less then the advertised size
It might be, but still need to remember after reformatting and installing an operating system it will take space on the harddrive. Also, there might be a 10gb partition on the harddrive. It is really hard to say.
Sorry to tell you this but your computer repairman is a moron.

You lose 2.5GB-5GB just by installing WINDOWS and the normal Microsoft programs and patches on to a machine.
The operating system partitions separate parts on the drive for itself and for system files. I can't imagine a repair person not knowing what was going on with that.I wouldn't want him fixing my computer.
probably allot of bad sectors. may be it's normal operation. Yeah I wouldn't want your guy getting his hands on my system I built myself. If you worried about it I suggest getting a new one they are really not that expensive anymore and will save you time and aggravation.

http://www.tigerdirect.com/applications/...
ya your computer uses about that much space in some cases to work with the hard drive. You may also have a computer that stores your backup copy of windows and your programs on a secret partion to help you be safe in case you need to reinstall everything some time.
I don't know what he meant by it was only a ten gb drive. But when you install windows, it's partition keeps about five gigs for the operating system, which means you only have seventy- five gigs free space.left.
Your O.S. ,,, Windows,, takes up SPACE..!

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