More efficient management of storage typically yields additional free space.

Increases performance on some devices by eliminating the need to write changes twice compared to HFS+ Journaled file systems.

Metadata corruption prevention due to creating new records instead of overwriting existing ones, which can become corrupt due to system crashes.

Uses checksums for data integrity of metadata.

Full-disk encryption with single or multi-key encryption for added security.

Allows for clones or multiple copies of the same file, with only changes stored as deltas, which reduces storage space when making revisions or copying files.If the issue persists, please reply to this thread and we'll do our best to help you! The resource below will provide some guidance: Is it possible that one or more of the files you are trying to access are corrupt? Try choosing a different file to open to test.ĭo you have a different external drive formatted with APFS that you can connect to your MacBook Pro 2016 to determine if you have the same issue with Finder and opening files on that drive? In case the issue is with the Seagate drive, do you have the files on that drive copied to another location? The Seagate Fast SSD Media external drive with the APFS and macOS Extended Journaled partitions connects and opens on the iMac with macOS Big Sur as expected.

If we understand your post correctly, the MacBook Pro you are using is a 2016 model that has been upgraded to macOS Monterey. It sounds like you are having issues accessing data on a partitioned external drive, and we'd like to help. Welcome to the Apple Support Communities! The workaround as highlighted above solved it for the moment. I am guessing it has to do with MacOS Monterey. Time Machine backups worked fine after that.ĭeducting from this, I see that it is not a hardware issue as much as a software issue, affecting both Time Machine and Disk Utility. After this treatment, the drive worked well with my new MacBook. Here the external SSD could properly mount and erasing + partitioning worked within 30 seconds. Workaround: I could solve it by using a Mac Mini 2018 with USB-C-Port, running MacOS Big Sur. I tried everything I knew, called Apple Support, but nothing worked (safe mode didn't work). The Disk mounted, but Time Machine did not work, nor could I erase the drive with Disk Utility.

Today I purchased a new SanDisk with USB-C connection to make a proper Time Machine backup.

USB-C drive did not work with either Time Machine or Disk Utility (see below).

USB3-drives are not properly recognized.

I had several issues with external USB drives, Disk Utility and Time Machine on a new MacBook Pro M1 Max with Monterey 12.0.1.

1 tb external storage for imac