Windows 10 lost a couple of hard drives and I can't find them. How can I get them back?

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Windows Central Question

Windows 10 lost a couple of hard drives and i can't find them

After upgrading windows from 7x64 to win 10x64 a few hard drives started vanishing. After the initial upgrade i had all drives accoutned for, then after a reboot windows lost 3 hard drives, can;t even find them in disk manager. However they are still visible in the BIOS.
I'm at a loss since a lot of my work is on those drives.
If anyone knows hot to solve this i'd be very gratefull