I've spent a little while now going through all the parts and things I can think of for the issue. I have had this drive for a while now and isn't a new drive, mainly used as additional storage to the main one. All the connections are fine and BIOS does recognize the drive and when I boot from an older backup it has no issues showing up under file explorer or disk manager. However, when I boot back into my main drive, it does not show up anywhere on windows, not device or disk manager, file explorer. Any ideas what could be the issue?