How to use an old hard drive as a data holder for my new computer?

i want to wipe the hard drive (windows 7 and all) and use it for backups and data storing now but im not sure how to go about this without re-installing windows.

on a side note the computer i took it from is trash thanks to screen optical drive and keyboard being gone (hdd is still good)
Update: i dont want any of the data, i do want to wipe it. also i will use it with traditional SATA inside as well as have an e-SATA dock for the laptop, basically an internal version of what i would use an external for
2 answers 2