The issue likely isn’t your destination storage medium, but rather the code that manages the database synchronization.
I agree but its strange that you can add tracks from version 4 engine to a database built in a prior version of engine with no issue.
I have the same problem and used the same solution! I also used windows 11 (the problem appears with macos) to create a disk with all the archive, no errors, prime4+ reads without errors, but if I connect the disk created with windows to one of the 2 pc with macos I do not see the archive! today I will do other tests!
I can confirm that the issue is with macOS only at the moment, my windows 11 install can manage the library fine - macOS I’ve tried all versions back to 3.2 and getting the same “corrupt” issue
Still not solved this issue with an update???
Yup. Still not solved as of yet.
Team Denon is aware.
FWIW, I have just found this thread after going half insane trying to work out what’s going wrong.
So “yes” same here Windows 11 PC, Engine DJ is OK on the PC but when a completed sync to an external SSD is performed, EngineDJ claims the Database is corrupt.
Looking at the SSD afterwards shows it’s missing the DB files, it only has the “Database2” folder and the “Music” folder listed.
Welcome back @Mixed.
I have a very strong feeling that a fix should be out soon. Some of us community members have been doing a lot of troubleshooting, including testing multiple OS’s, File Systems, File Types and what not. =)
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I finally got a chance to add new tracks to my environment and do a sync to my SC6000M - no issues 
I finally got a chance to add new tracks to my environment and do a sync to my SC6000M - no issues
Would this be with some form of update??? I still cannot get a Sync to SSD, EXT HDD or USB Stick to complete with it being Corrupted.
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I mean to post my comment elsewhere and I feel stupid for posting it here. I apologize for that. 
Team Denon are certainly aware of this problem and continue to work on the issue from my understanding.
Don’t worry, I just got a bit excited that I may be able to use my gear again
Hi friend, solved problem with new update?