![]() ![]() ![]() The behavior is the same, regardless of how the drive is connected. Obviously, it's unlikely that I managed to procure two defective drives, so I'm thinking there may be something wrong with my machine.Īnother note - I've tried doing the format with the disk connected to both USB 2.0 ports on my machine, as well as connected through a USB hub. This is the second disk I've tried this with - I sent the first one back to Amazon thinking it was defective, and they sent me a replacement. Cannot unmount volume Hi there, I have a 2013 macbook pro and need to reinstall (drive filled with ‘system stuff) but each time I go to disk utility I get - the erase button is light grey (so I can't select it) and it says 'This operation can not be performed because you can not unmount the volume you are booted from. If I try to create a new partition with the same filesystem, I get the following error: Partition failed with the error: Your Mac will permit you to delete the drive if you boot into recovery mode (hold down R while booting) and use Disk Utility to format it or if you do a. 1 Hey guys, I am trying to reformat my Macbooks hard drive as i am giving it to my mum as i have a new macbook and im trying to reinstall Mac OS X Lion on it. The underlying task reported failure on exit Note: Reformatting the drive will erase all data on the drive, so you should copy any data you want off the drive prior to formatting. When I click "Erase", I get the following error after only a few seconds: Volume Erase Failed with the error: macOS 10.15 (Catalina) macOS 10.14 (Mojave) macOS 10.13 (High Sierra) macOS 10.12 (Sierra) macOS 10.11 (El Capitan) Not sure what version you are using Click here to determine your version of macOS. I click the single partition on the disk, choose "Mac OS Extended (Journaled)" for the Volume Format and leave the name as-is. When a device cannot erase or partition the drive, users are delivered Couldnt Unmount Disk error or related messages. I connect it to my white Macbook (purchased late 2007, 2.14 GHz with 2 GB Ram), open Disk Utility. SD cards are just not reliable - I deal with hundreds of them for work & theyre just not worth the effort once they start to fail. If it still wont unmount/format, throw it away. I have an Iomega Prestige desktop hard drive (1 TB) which I purchased from Amazon. 101 1 4 If it wont unmount, reboot the Mac. ![]()
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