disk hardware failure (-36,2747) using DiskWarrior 4.4

27" iMac (late 2012) running 10.14.6 Mojave

An external drive (a Porsche Design 3TB USB drive) that was my TimeMachine drive went off-line, and there was an alert to not disconnect a drive without Ejecting it first (which I always follow). I disconnected the now-unmounted drive, powered it down, re-connected it, and re-started it. DiskWarrior (4.4) reports a hardware failure (-36, 2747) [I don't know if that's a number in the thousands, or two separate numbers, one negative and one positive]. ALSOFT's site says the -36 is a hardware error — bad, obviously.

MacOS's DiskUtility reports no error on it, and it mounted, I started FirstAid and FirstAid is still running. No details in other than:

Repairing file system.

Volume was successfully unmounted.

Performing fsck_hfs -fy -x /dev/rdiskNsM

Checking Journaled HFS Plus volume.

Detected a case-sensitive volume.

Checking extents overflow file.

Checking catalog file.

Checking multi-linked files.

Checking catalog hierarchy.

Everything's either gone, or some of it's still there, so I'll let the First Aid run overnight.

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