External drive shows in finder as a CD & no longer shows as "Journaled", after accidental unplug

I accidentally unplugged two external drives while using them. (I know, I know! Tugging on the wrong wire at the wrong moment...)
The result:
One large external hard drive now shows up in finder as a CD (i.e., shows on desktop as a mounted CD not as a hard drive).
The same external drive no longer shows formatted as "Journaled" in Disk Utility.
(The second external drive still shows up as an external hard drive on the desktop, and still shows up as Journaled in Disk Utility.)
Questions:
Is the damage to the external drive itself (so that finder thinks it is a CD, and is not Journaled), or to some information on the Mac?
Can this be safely repaired in some way, or must I reformat the external drive and restore its content form a backup (yes, I have one!, but it will take a long time to do.)
Thanks!

Once I got hold of my offsite backup I could boot from that, and discovered that the external drive showed as fine, i.e. passed disk utility, showed as journaled, etc., and looked normal, while it was Macintosh HD which had numerous errors beyond the ability of Disk Utility to correct. Restoring Macintosh HD from backup has fixed everything. Odd thing, the way running Disk Utility from the damaged partition showed such anomalous results for the external drive.
Thanks for your help!

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HI
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External drive shows in finder as a CD & no longer shows as "Journaled", after accidental unplug

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