So enter the following into the Terminal window: dd if=/dev/zero of=~/stupidfile.crap What we need to do is to start making a file that will grow until the disk is full. Open the Terminal application in Applications/Utilities. Let’s Fill Up The Disk To The Brim To Remove Purgeable So here’s how to do it in Mac OS High Sierra. That’s because APFS is smart enough to recognize that it’s the same file, so it makes pointers to the original data, so it doesn’t take up extra space. APFS – How a Smart File System Can Make Some Things Difficultīecause Apple has changed to a much smarter file system, my old method of creating a file and then duplicate that file until the disk was full, thus forcing Mac OS to start to remove the Purgeable portion of the drive doesn’t work anymore. That is all handled by the operating system.
If you don’t understand the above, don’t do it! The method is not a way of getting more space. Usually for installing Bootcamp or having multiple partitions on a drive.
Read this before continuing: Only use this for making more room if you need to change the partition size of your disk. So here is how to remove the Purgeable part of the disk in Mac OS High Sierra. Because of that, my old guide doesn’t work. I’ve written an article on how to remove the purgeable portion on a hard disk on Mac OS, but in High Sierra, Apple has changed the file system from HFS+ to APFS.
