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Dual-Boot Win7/Win10 on seprt HDD's - Both HDD's detected, 7 wont boot
I have a dual-boot setup on a Dell XPS 8900 that I've had since Feb/March. The dual boot setup has been working fine, with zero issues since then, then this week I just booted into Win7 a couple days ago and it ran chkdsk automatically, erased some files, restarted, and booted into Win7 fine. I used my OS with no issues and shutdown. But this morning I tried to boot into Win7 and my system can't find the operating system.
I bought the computer from Dell with Win10 installed on their standard 1TB HDD and added a WDC 2TB HDD and installed Win7 in Legacy. I can still boot into Win10 with no problem in UEFI, and while using the OS I can see my other Win7 HDD, all the files are still there and I can access them. My system can even detect Win7 in UEFI mode and will begin to boot to that OS (but of course, freezes at the logo screen because Win7 won't run on UEFI). The BIOS detects both HDD's and diagnostics says that everything's fine with both, but when I try to boot into Win7 in Legacy mode I get a no boot device error.
I've run the Windows7 install CD to try to run diagnostics and repair startup files, but all the diagnostics, including chkdsk, come back with zero issues, except 0x01f and 0x495 which only says that something was changed, but nothing specific...
I can't tell if the problem is with my startup files, MBR, or BIOS...
I've already backed up my Win7 HDD, but I'd rather not have to reinstall Windows cuz all my gaming stuff is on that HDD...
Can anyone help?