So I was rushed (and being careless) and accidentally copied about 80 MB of a Raspberry PI image (SD card formatted extfs) over my external USB drive (4TB) that was formatted and encrypted (using Disk Utility but not sure of the specifics).

I tried following Recover deleted Encrypted OS X Extended volume and looked through Rebuild partition table on external HDD - not writable but still haven't managed to get the drive recognizable by my laptop (Mac OS 10.13.6 - where the drive had been mounted previously).

Running TestDisk did find these partitions (I assume from the backup GPT?) before I started making any changes:

#1557837238 Disk /dev/rdisk2 - 4000 GB / 3726 GiB - 7814037167 sectors
 1 : start=       40, size=   409600, Id=00, P
 2 : start=   409640, size=3518398048, Id=00, P
 3 : start=3518807688, size=   262144, Id=00, P

(Note that I think the sizes may be incorrectly reported as I didn't change the disk geometry before running the scan)

Following @klanomath's excellent instructions in the first answer above, I did recreate the partition table, so now gpt -r show /dev/disk2 does give:

       start        size  index  contents
           0           1         PMBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6         
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640  7813365343      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC
  7813774983      262144      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  7814037127           7         
  7814037134          32         Sec GPT table
  7814037166           1         Sec GPT header

However, diskutil cs list still reports No CoreStorage logical volume groups found.

I'm unfortunately out of my element here and not sure how to proceed.

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