PSA: Monterey 12.4 corrupts data written to ExFAT drives

[Fursty Ferret]

Just a heads-up for anyone that uses ExFAT on external drives - verify any data you copy across. I've been able to reproduce a problem with corrupted video files on USB drives formatted with ExFAT (via Disk Utility). Tried three drives from three different manufacturers so far - all have corrupted data once the file size exceeds about 2GB.

 

[Fursty Ferret]

Resolved: Apple Support suggested restarting into Safe Mode, and then back into normal mode. And it fixed the problem. Why it happened in the first place though is anyone's guess...

 

[bogdanw]

I think it’s a Finder issue, it happens in Big Sur too https://forums.macrumors.com/threads/copy-files-cant-copy-all-metadata.2343908/post-31076938

 

[Fursty Ferret]

Interesting. Apple support seemed to recognise the problem straight away and advised of a fix, but during the troubleshooting I was also able to reproduce it on a drive formatted with APFS too. ExFAT did give the impression of copying much faster though.

I suppose rsync is a workaround but it is irritating because I don't know what triggered the issue or how much stuff is corrupted.