Salcedo9806 :
Hi, i was wondering if i can use my old hard drive to my newly built pc, can i install windows to a new SSD and use my old hard drive and keep my old files, games in there? What do i have to delete so i can use my old hard drive to my new pc without doing a back up or reformat?
Yes you can do what you want. Simply detach the HDD and install Windows on the SSD with the bios in SATA AHCI mode. Then you can reattach your old drive and it will work fine.
You will, however, have to reinstall any games that are on the HDD for them to run under the new OS unless they are STEAM games, then you simply need to reinstall the STEAM application and change the game file location to where it is located on the HDD. You can access data files with no issues.
The only thing that is important is that the OS drive has the same SATA mode set as the bios, secondary drives will run fine on the same controller.
note: if you have a really old SATA 1.5 drive you may need to use a jumper on it for compatibility, but those drives are almost all gone, so very unlikely an issue.