Question Cannot boot from original M.2 SSD when second one is added ?

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rcfant89

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Oct 6, 2011
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I had a 500GB Samsung boot SSD. Wanted a bigger one so added a 1TB and cloned it from the original.

I pulled the 500 out and have been running perfectly off the new 1TB for a long time. I decided to add the 500 GB back as a spare drive, but now it will ONLY allow me to boot from the original 500, not from my 1TB.

I select the 1TB in bios to boot from but it just boots from the 500. The disk shows up in disk management , claims to be "online", but only the original 500GB one shows up in windows explorer. I want to wipe the 500GB one and use it as a spare drive but Windows won't seem to allow me to boot from the 1TB one so that I can wipe the 500.

I can't offline the 500 either, since it's in use. What gives?
 
What are model names of your drives?
What is model name of your motherboard?

Using M.2 drive sometimes disables onboard sata ports.
You may need to connect your sata drive to a different sata port.
Read motherboard user manual.
 
I was able to figure it out. Selecting the drive to boot from in bios did NOT work. Windows Boot Manager overrode my selection and booted from the wrong disk. Disabling the 970 evo and Windows Boot Manager (970 Evo) allowed me to boot into the correct disk, but then the 970 Evo didn't appear in windows.

Solution: Enable BOTH disks in the bios, but DISABLE "Windows Boot Manager (970 Evo/the wrong disk)". This allows booting from your disk of choice AND allowing the second disk to show up in windows so you can wipe it.

Not sure why WBM overrides the bios selection of the proper disk, but that's what it was doing for me. YMMV depending on your mobo/bios/config, perhaps?
 
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