![]() I found I had to unmount the logical drive first, then I could delete the. fdisk doesn't do anything.Īny ideas how to fix a disk that is this severely screwed? -bash-3.2# diskutil listġ: Apple_Boot Recovery HD 650.0 MB disk1s1Ģ: Apple_HFS Mac OS X Base System 1. disk Creating the partition map Error: -69877: Couldnt open device. When I attempt to run fdisk to correct the MBR. To unmount the volume, start by accessing the disk utility. For example Mac OS Extended (Journaled) or APFS. ![]() If you are using it for Mac only then select a format specifically for macOS. To resolve this, you must first erase the disk and set the Scheme to GUID Partition Map. I get an "error 6988 couldn't unmount disk". Method 3: Use the terminal application Method 4: Repair with a recovering partition Method 1: Right Steps to Unmount Volume for Repair on Disk Utility The simplest solution to unmount volume for repair is to unmount the disk on disk utility. If you hover your mouse over the partition button you can see the tooltip provided by Apple. Now in Disk Utility, sometimes I see the SSD drive and sometimes I boot and it's not there but I can never erase or partition it. ![]() I erased the SSD drive in my MacBook and was reinstalling Lion when it failed about 75% through the install. I run OS 10.13.6 on iMac and MacBook, and recently bought a Western Digital 3TB external drive, formatted it for Mac, installed OS 10.13.6 in one large partition (of two) and used it for two weeks. ![]()
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