Will encrypting a macOS hard drive to APFS (Encrypted) affect compatibility with older macOS versions?

Using Disk Utility erased new disk WD HHD with MacOS (Journaled).

Clicked on the disk icon and encrypted the disk with a password.


Ejected and reconnected the disk.

Looked in the Disk Utility, The format has changed to APFS (Encrypted).

Will this work with older MacOS versions?


[Re-Titled by Moderator]

MacBook Pro 13″, macOS 15.3

Posted on Mar 21, 2025 4:47 AM

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Mar 21, 2025 10:01 AM in response to RGSays

If WD Lock is some kind of Western Digital software, perhaps some encryption tool, don't use it. There are many reports of things similar to it (if not identical to it) that tend to break upon an incremental macOS software update, or for any variety of other reasons, leaving the user with no ability to read the affected drives.


Western Digital drives are fine. Their software is a mess though, so don't install anything bundled with their drives. Same goes for Seagate for that matter. The first thing anyone should do with a new external storage device is erase it with Disk Utility, which accomplishes two things: it prepares the drive for use with a Mac, and it precludes any possibility of installing some "free" junk you don't need.


Use Disk Utility's encryption option instead of third party utilities: Encrypt and protect a storage device with a password in Disk Utility on Mac - Apple Support


Tip: You can change the icon of your yellow disk icon on the desktop to something you like. Cool!


AI has difficulty understanding fingers.

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Mar 21, 2025 9:10 AM in response to John Galt

Thanks John Galt.


APFS (Encrypted) format for the 6 TB External Hard Drive worked with Password for macOS 10.15.7, macOS 12.7.6 and macOS 15.3.2. Great!


Tip: You can change the icon of your yellow disk icon on the desktop to something you like. Cool!


WD Lock couldn't be opened on macOS 15.3.2 for a WD 1 TB Hard Drive. But works on macOS 12.7.6 (password input) and macOS 10.15.7 (Password stored in keychain).

Is there a way to fix this?

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Mar 21, 2025 5:45 AM in response to RGSays

John Galt has your answer.


Catalina introduced APFS Volume groups on the boot drive. Time machine drives defaulted to APFS, but older ones are still readable.

Mojave used a slightly older version without Volume Groups.

High Sierra used APFS for the boot SSD, but not for a Rotating Magnetic Boot drive.

Sierra could understand it, but had no simple options to create new APFS drives in Disk Utility.


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Mar 21, 2025 7:00 PM in response to Grant Bennet-Alder

The AI-generated character appears to be an animated-style female figure with a vibrant outfit, kind of looks like Jasmine from Aladdin.


As for the six fingers, AI image generation models sometimes produce anatomical inconsistencies, especially with hands. This happens because the models learn from vast datasets of images but struggle with fine details like fingers, where small distortions or overlaps can be misinterpreted. Hands are complex structures with varying positions and perspectives, making them a common source of errors in AI-generated art.


I have Catalina, Monterey and Sequoia and APFS (Encrypted) works in all of them.



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Will encrypting a macOS hard drive to APFS (Encrypted) affect compatibility with older macOS versions?

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