Originally Posted by Valgaur
Okay so im installing w7 on my second partition on my SSD. That IDE worked for XP so now its on my SSDs partition 1. But i tried booting into xp but it said something about compatibility and such. So im putting 7 like I said above. How do you dual boot with two OS on the same hard drive with those ide and ahci differences? I can change it in bios to xp and W7 files for much easier loading but then would I get that error??
I don't know what the message says about compatibility, so I don't know what error this is or what it's pertaining to. Can you recreate it and try to post exactly what it says?
However, this may be what you will have to do:
When you are sitting in Windows 7 (meaning, AHCI mode is enabled) and you have a desire to boot into Windows XP, you would first have to switch to IDE mode in the UEFI BIOS. When you save and exit out of the BIOS, you'd boot directly into Windows XP because Windows 7 would give a BSOD during startup due to IDE mode being enabled. Although again, this can be avoided by making that change in the Windows 7 Registry that I mentioned before even though it would result in slightly lower drive performance due to IDE mode being used.
So when you're in Windows XP (with IDE mode enabled) and you want to go back to Windows 7, you'd switch back to AHCI mode in the UEFI BIOS first.
I actually had Windows XP on a separate drive for a long time when I was new to Windows 7, so this is what I had to do whenever I wanted to go back to XP for whatever reason.