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Seems your drive has a problem, iMac is seeing the WD 2TB as 0B of capacity. Look at disk0.

If you can, remove and test the WD 2TB drive on your Mac Pro.

Yeah. I ran the DriveDX and it just says "Drives with SMART support not found." Thanks, I'll try the drive out in the MP.
 
Seems your drive has a problem, iMac is seeing the WD 2TB as 0B of capacity. Look at disk0.

If you can, remove and test the WD 2TB drive on your Mac Pro.

My Mac Pro reads the WD drive as disk2 and SMART status verified.

Partition Map: Not supported.
 

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Seems correct on you Mac Pro with current firmware. Could you please take a picture of the label of the WD 2TB drive?
 
Oh, that just changes its rank or something?

I've asked to you confirm if still disk2 because sometimes on a reboot, Mac changes the enumeration of disks, so before formatting/erasing/zeroout it's nice to check if the drive that you want to work still has the same diskID.

caffeinate disables your Mac Pro sleep while executing the command.

diskutil zerodisk write zeros all over the disk, removing everything on the disk.
 
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I've asked to you confirm if still disk2 because sometimes on a reboot, Mac changes the enumeration of disks, so before formatting/erasing/zeroout it's nice to check if the drive that you want to work still has the same diskID.

caffeinate disables your Mac Pro sleep while executing the command.

diskutil zerodisk write zeros all over the disk, removing everything on the disk.

In process now. Looks like it's going to take awhile.
 
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After the zero discing, it appears there has been no change to the drive and its number.
 
Did you tried to format and use it?

Code:
diskutil erasedisk JHFS+ WD2TB GPT disk2
 
Yep, if still disk2.

For some reason, it couldn't find Disk2 when I did that command (now that I think about it, I did use all caps for DISK2—maybe that was the cause). So I erased it in disk utility instead.
 
One test is installing macOS on the drive. Flaky drives usually do not complete the installation. Since your drive completes the zero-out, just install 10.13.6 and test it.
 
One test is installing macOS on the drive. Flaky drives usually do not complete the installation. Since your drive completes the zero-out, just install 10.13.6 and test it.

OK. This won't effect the SSD as my boot drive?
 
OK. This won't effect the SSD as my boot drive?

On a Mac Pro you can have macOS installations in every drive installed, and select what drive you want to boot with the boot selector (power-on with Option pressed).

If you don't want to risk messing with your SSD in any way, just remove it from your Mac Pro.
 
On a Mac Pro you can have macOS installations in every drive installed, and select what drive you want to boot with the boot selector (power-on with Option pressed).

If you don't want to risk messing with your SSD in any way, just remove it from your Mac Pro.

Oh, that's neat. So much flexibility with these Mac Pros. Wish I had gotten one earlier.
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On a Mac Pro you can have macOS installations in every drive installed, and select what drive you want to boot with the boot selector (power-on with Option pressed).

If you don't want to risk messing with your SSD in any way, just remove it from your Mac Pro.

If I can successfully install the OS on the WD drive, can I then try putting it back in the iMac and see if it works there?
 
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