Hey there! So I had a drive fail due to bad sectors and I got a replacement. After installing windows on the new drive, I plugged in the old drive to try and recover data but windows wont boot. I see both drives in the bios.... the boot priority is fine, I know it's not that. I think it has something to do with the fact that it was a boot drive as well. My bios setting for sata control mode is IDE... but i think changing that can harm my good boot drive. I do not have an external enclosure to test via usb. i have tried different sata ports as well. Any ideas? Thanks so much!
More aboutadded additional sata drive windows wont boot
Most likely the drive is really bad now and can no longer be identified by windows. You can try to start windows and hot-plug the disk. connect the power first and for it to spin up, then plug the sata in.
try removing your newly add drive and check first it you can boot into the windows. then again try to add the new drive.