80GB Hard Disk Shows Only 75GB Useable Capacity

My 80GB HDD shows 75GB of spece while partitioning drive & installing XP SP3. Is it any to wrong with HDD or ??? waiting for your updates

That’s normal. Windows reports a drive as smaller than what it says on the sticker.
If you look in BIOS you’ll see the full capacity.

The reason is that HDD manufacturers use 10^3 (1,000) to define 1 kilobyte – Windows use 2^10 (1,024).