Original Xbox HDD useable as a normal PC HDD?

I recently got an old PC from the Salvation Army, and decided to harvest it. Turns out I can use all the parts for a working computer(an old computer running Windows 98 on a Pentium II, but a computer nonetheless). However, it has a 4GB HDD. This threw me off of the idea of reusing it, until I remembered my old original Xbox that I harvested(I do that a lot), and luckily I kept the 80GB HDD from it :D. It has the same old standard PATA  and 4-pin Molex power connector as the 4GB. It's just a normal Microsoft HDD(from external appearances). So can I use it as a normal hard drive for my recently obtained old computer, and just format it? Or is there some kind of encryption/coding that makes it only useful for an Xbox?