my mum currently has an old laptop with only a HDD on it that has about 800Gb worth of data, and the OS is in there. I recently got her a new machine, which has an empty HDD bay in it, as well as a small 256Gb SSD for the OS. Can I simply install the HDD in her new machine to get her all the data on it, or will having 2 OS installations mess with stuff? looking for a "no future tinkering" solution, as my mum has no idea about tech and I wouldn´t really consider myself that handy with software stuff either