What a waste, destroying a hard disc; when you get the new PC get one with an SSD say 256Gb to use only for software, install the old hard disc and use it for storing data, images, music etc. The SSD gives you a faster machine but a large SSD costs more, so use the old disc for the data which is not so dependant on speed.
Both my PCs came with 256Gb SSDs and I installed 2Tb hard discs from older machines, my laptop has a 125Gb SSD and a 500Gb external drive, plus I have a couple more External drives one is image back up, the other video and music back up.