Windows 10 doesn't see some Hard Drives

Steve C said:

It seems your problem is solved but you might have tried this fix.
Open an Admin command prompt then press Enter after each command:

diskpart
automount enable
exit
exit

^ A very good suggestion but I am not sure whether it would apply here with the disk/s not appearing in Windows Disk Management. Notwithstanding, the OP could try it with the following sequence

Start > All Programs > Accessories > Right click on Command Prompt and Run as administrator.
Then
diskpart [ENTER]
Against the DISKPART prompt
automount [ENTER]
Does it say "automatic mounting of new volumes disabled" ? Then
automount enable [ENTER]
"automatic mounting of new volumes enabled"

Close Command Window.

https://www.sevenforums.com/hardware...-assigned.html

It had to be the drive itself. I just took 4 drives out of my X99 computer. Installed them into the new computer with no problem. So there had to be like a hidden partition or something else. That the X299 and windows didn't like.

My HHD Drive 0 is working fine as far as I know, but it is only used for storage and I don't STORE much. I was fooling with the command prompt trying to remember a lesson under DiskPart you guys taught me years ago in 7, but it disappeared from "This PC". You can open Disk Part and it's right there! I just can't get it back to "This PC". Some fool thing I did caused it to run off and hide from me! HELP!