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1. Format wd passport for mac couldnt unmount disk how to#
2. Format wd passport for mac couldnt unmount disk mac os x#
3. Format wd passport for mac couldnt unmount disk mac os#

I had been trying all sorts fro things and this was the best one. THE KEY STEP: When DU starts erasing the drive and writing zeros, a Skip button appears.Ĭlick it (unless you really do want to write zeros, which can take a LONG time).

Select the second most secure option just to the right of Fastest (in earlier versions of DU I think it included options like write zeros once, write zeros 35 times, etc.), then click OK 5. I am able to run linux mint off a usb, but I am new to it so I dont want to make a wrong move. Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above. Go to First Aid to verify and repair the disk, or go to Erase to format the disk. So I pulled up diskutil (the GUI version) and tried running it to give the drive First Aid and thats when I got this error. Reboot the Mac holding down the Option key and choose the Recovery partition. I powered the drive off and powered it on again and it mounted. We had a power outage on 1122019 and this apparently caused some issues with the external drive.īackups didnt happen, and I looked and found the drive had not mounted. Problem is that this is a recurring issue in mojave on my fusion drive. Thus this is only appropriate if you plan on formatting and erasing the disk to you are force ejecting anyway.įor the example syntax here well use devdisk3 to forcibly unmount from command line, and using sudo which will gain superuser privileges for the task. In that case, youll need to boot from a separate USB drive to fix the error. This will not work if the error was triggered by attempting to modify the boot disk through partitions or formatting, and you will need to use the method above with a boot disk instead.

Format wd passport for mac couldnt unmount disk mac os#

Such boot drives are easy to create on your own, here are instructions for making boot disks for OS X 10.9, OS X 10.8, and OS X 10.7.įor older Macs running prior versions of Mac OS X, typically anything running OS X 10.6 or earlier will have a SuperDrive, and thus shipped with a bootable DVD that can serve this same purpose. The above steps did the trick and everything was working again as expected.

Format wd passport for mac couldnt unmount disk mac os x#

You will need any Mac OS X boot drive to complete this task, I used a Mavericks boot installer drive for this purpose but others should work too, whether they are installation drives or just recovery drives, the important thing is they are bootable and separate from the primary boot disk that stores the installed OS. Well also show you a way to forcibly unmount a disk by command line, though that approach must be used with caution as it can lead to data loss on the drive in question. Format Wd Passport Couldn'T Unmount Disk Mac OS X Its Forįor the boot drive, it shouldnt matter which version of Mac OS X its for (assuming 10.7, 10.8, 10.9, 10.10, 10.12, 10.13, 10.14, etc at least), the only requirement is that it has Disk Utility which they all do.

Format wd passport for mac couldnt unmount disk how to#