Not the drives I'd think.
Seems that M.2 and SATA Express system on the motherboard may have failed, or needs some settings in the BIOS changed. Check in BIOS for IDE, PATA, SATA, M.2 and other settings having to do with those particular bus settings. Something simple as changing AHCI and settings in a BIOS can cause this.
MSI Z97 1 250Gb Crucial SSD, 2 WD HDD @ 1Tb WD10EZEX and 3Tb WD30EZRZ, GTX 970, I5 4960k, ASUS disk drive
Last night I ran windows update. Today I was unable to boot my computer. It was stuck on the BIOS screen with a loading icon spinning indefinitely. I then did some troubleshooting.
* Unplugged both HDDs from MOBO and computer successfully booted to the desktop. Leaving either one plugged in caused the same boot issue above.
* Tried switching around SATA cables and ports
* Verified boot priority is set to the SSD
Now that my computer can boot properly I sought to reformat, reinstall, troubleshoot the two drives so I can still access my data, however, I am currently unable to access the drives
* Drives do not show up in Device Manager or Disk management after reconnecting them after a successful boot
* Drives do show up in BIOS but need to be unplugged in order to boot.
* Drives were partitioned correctly and setup and in use yesterday
* Selected hidden drives in (View>Hidden drives) diskdrives and verified the latest drivers for the devices were installed.
I'm aware that windows can sometimes have issues with installing parts of windows on other drives causing a boot issue but the usual fix would be to reformat the drives however I can even access them. Can someone help me with this issue? I would also very much like to recover the data on these devices. Let me know if there is any information missing that may help.