Even if you’re using SSD as a Time Machine drive, it’s not compatible with APFS.
For Time Machine backups, use MacOS Extended (Journaled) if it’s a mechanical hard drive or if you’re using macOS Catalina or earlier. 
If you have older Macs (pre–2016), particularly those too old to update to a recent version of macOS, choosing HFS+ will enable you to use your external drive with those machines. If you bought a Mac between those dates, it shipped with macOS (or OS X, as it was known) installed on an HFS+ volume. Mac OS Extended, also known as HFS+ (Hierarchical File System Plus), was the primary file system used for Mac system storage from 1998 until APFS launched in 2017. Here are some of the best apps that read-write APFS on Windows. You can only access drives formatted with APFS on Windows through third-party apps. If you connect that disk to Catalina, Time Machine won’t recognize it. Time Machine volumes formatted as APFS will only work with Macs running Big Sur or later. It’s fast, consumes less space, which means more room for backups, has greater resistance to data corruption, and copies cloned or sparse files efficiently. Time Machine backups to APFS are impressive when compared to HFS+. However, you won’t be asked for this option for the already formatted HFS+ disk. Apple lets you format an external drive and choose APFS for Time Machine on macOS Big Sur. An external SSD gives you the best performance over APFS, provided you don’t need to use the drive with other pre-Sierra Macs. 
If speed and convenience are your top priorities and cost is not an issue.sudo mount -o loop Downloads/fossapup64-9.5. We also add the -o loop argument to create the loop device which tricks the operating system into believing this is a real disk and not an image. The usage of the mount command is similar to previous uses and includes the path to the image and the path to the mount point we created in the previous step. We need to run this command with root privileges so therefore we use sudo. Mount an ISO disk image using the mount command and the loop argument. Again this could be anywhere in the file system but we have created a directory called iso within the media directory. Create a directory called iso in the media directory to mount the disk image into.
In the following example, we have used a downloaded disk image of the Puppy Linux distribution but this technique would work with any disk image including images made of disks for backup purposes.ġ. This is a useful technique if you want to copy some content out of a disk image or if you simply want to inspect a disk image’s contents. It is possible to mount a disk image to appear as a read only drive.
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