[SOLVED] Two HDD (W10 - W7) in one PC stepping on each other

Sxino

Honorable
Apr 3, 2015
62
3
10,645
Hi everyone, i have been using Windows 7 (W7), but now i am upgrading to Windows 10 (W10) because of company policies. I have choosen to use a new HDD to install W10 (disconnecting the old W7 HDD before).
When i installed all programs to the new W10 i restarted and also connected my old W7 HDD (to set priorities in BIOS) and booted the W7 to try its all ok.

I have been working with W10 for 2 weeks and needed to use some programs in the W7 HDD and tried to boot it. It begin booting but my pc rebooted immediately and it tried again booting W7 (have set it in priority) and cannot boot. I changed priority in BIOS to boot W10 and it booted normally.

I have read about when you connect 2 HDDs, one will be master and "automatically" the second one you connect will be "slaved" (Practically what i have done). Was this what happened to my pc? I still can open every folder and documents of my W7 HDD from W10 HDD.

Thanks in advance for your comments.