Both internal hard drives have disappeared!

[PeterOReilly]

I have two internal hard drives in my PC, E and F (in addition to the C drive - SSD), where I store and backup all my data.Yesterday, I was deleting some (I thought) unnecessary files from my oem folder, in preparation for a Windows 10 reinstall.Today, when I open the PC, both E drive and F drive are not visible in File Explorer. When I open Disk Management, I see the C drive, and two removeable disks, J an K, which are marked as "No Media".How can I recover these two "missing" drives?Thanks

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