Mac disk utility unable to unmount volume for repair, external hard drive full#
There are two invaluable commands which reveal disk and volume structures in their full detail: the older diskutil list, and a new supplementary diskutil apfs list which concerns itself with APFS volumes.ĭisks, internal or external, commonly come in two forms: those using the old HFS+ (Mac Extended) file system, which are still required for local Time Machine backups, and those using the new APFS. The diskutil command in Terminal gives you a wealth of detail, which you seldom need in day-to-day work, intended for when you need to refer to volumes using their Unix names, such as disk3s2.It doesn’t give full details, or even show all available volumes, though. Disk Utility shows what you need to use when creating and working with storage volumes on different disks.
(period or full stop) to show hidden items, but that is at best a temporary measure, and still doesn’t reveal full detail. You can always make it a bit more literal by pressing Command-Shift. The Finder shows you a simplified view which you need for everyday handling of documents, apps, etc.There are three different ways of looking at the disks and volumes on your Mac, which don’t always precisely match:
This article aims to unravel that so that you can better understand the Finder, Disk Utility, and the command line across each recent version of macOS. Now with Catalina and its strange paired System and Data volumes, it just seems a bewildering mess. Then came High Sierra and Mojave with APFS, which complicated that with features like containers, and the simple illusion offered in the Finder didn’t bear much resemblance to what Disk Utility shows, and is further removed from Terminal’s shell. What we saw in the Finder and in Disk Utility was reasonably close to what we needed to use, and wasn’t too far from what you’d find using the diskutil command in Terminal. Until Apple introduced APFS, the normal structure of our Mac’s disks and volumes was relatively simple.
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