I encrypted a micro SD card using El Capitan (10.11.6) and it would not open on older Snow Leopard (10.6.8). What are the rules of encrypting a flash or hard drive for forward or backwards compatibility?
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MacOS encryption compatibility in OS X
- Thread starter jshannon01
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FileVault 2 didn't exist in Snow Leopard, and was first released in OS X Lion, 10.7, so Snow Leopard will be unable to read anything you've encrypted with FileVault 2.
Are you using APFS? I read in Apple support documentation that Mac OS Extended Journaled (be it encrypted by Disk Utility or not) works in macOS 10.12 and older.
Dark, no on the APFS for now. I did just learn to put Monterey on an external SSD, to test out before maybe putting on main drive.