I ran the following commands in Terminal: Use the Finder to do the copy, not cp. More to the point, jumping back to what I posted in earlier, this pattern (logical size > physical size) is the easy way to check if you're looking at a compressed file: Get Info: Size: 56,090 bytes (45 KB on disk) Similarly: I tried copying the same System/Library/CoreServices/Finder.app/Contents/Resources/Invitation.aiff file to a FAT volume connected via SMB, and the results are the same. The system is ACTIVELY trying to prevent compressed files from leaking out of its control. Basically, it will only preserve compression when you're doing local copies to file systems that specifically support it. That means APFS-> APFS and MAYBE HFS+. Note that this does NOT include smb. If you start with a compressed file and copy it across smb, the system ends up decompressing it as part of the copy. That's almost certainly what happened here: but the output of each of these commands was em
Topic:
App & System Services
SubTopic:
Core OS
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