disk utility volume could not be unmounted

Hex code or GUID (L to show codes, Enter = AF00): 8300Ĭhanged type of partition to 'Linux filesystem'įinal checks complete. Partitions will be aligned on 8-sector boundaries Main partition table begins at sector 2 and ends at sector 33įirst usable sector is 34, last usable sector is 250000006 Warning: Devices opened with shared lock will not have theirįound valid GPT with protective MBR using GPT.ĭisk /dev/disk1: 250000040 sectors, 119.2 GiBĭisk identifier (GUID): B791964B-307B-49C4-850A-6C8410A44C1B

You have to download and install gdisk.īelow are the commands to change disk1s2 and disk1s3 to Linux type partitions. Note: The gdisk command is not part of macOS. One way to accomplish this is to use the gdisk command. If you wish to destroy the Core Storage arrangement, then start by changing the partition type to Linux. dev/disk1 (disk image):Ģ: Apple_CoreStorage lvgDave 127.7 GB disk1s2Ģ: Apple_CoreStorage lvgDave 999.7 GB disk2s2

Be aware that a small error can delete the wrong disk, that there is no going back from it, that it takes a long time (though usually you can stop it with ctrl-c after the first percentage above 0 appears), and that it may destroy a disk (lots of zeros will be written).īelow is the output from diskutil list of an the arrangement to be used in this example. Use it only when deleting is unsuccessful. You use it on both disks and let Disk Utility repair the Fusion Drive again.

But it also only works when unmounting worked. On a sidenote, the zeroDisk option in Diskutil cleans up your disk more radically (and wears down the SSD more), but may help when issues remain. Try to exclude the disk from spotlight, time machine and so on.Īfter that, there are a few unmount options in the terminal - sometimes, you have to unmount the volumes before you unmount the disks, or vice versa, and such.Īlso, a few times in my past, the disk utility from the gui could unmount something which the diskutil command could not.Īs a final recourse, try all this with the online recovery (it tends to be less likely to mount something) and/or the original version of MacOS your Mac shipped with (it may not understand new features of your Fusion Drive's file system, which is an advantage when deleting it). Something may be mounting the disk on your startup system.

Disk utility volume could not be unmounted