![]() ![]() This error generally results from improper modification of the boot drive, such as partitioning, disk verification or repairing or formatting. However, it still can fail to fix disk issues accompanied with some error messages, such as “Couldn’t Unmount Disk” error. Disk Utility plays an extremely important and good role in solving disk problems on Mac system. This article will focus on this error and provide 5 feasible solutions. “Couldn’t Unmount Disk” error message usually pops up when you try formatting, partitioning, verifying or repairing internal disk by Disk Utility on Mac system. ![]() Diskutil unmount force disk0s2 newfs_hfs -v 'Macintosh HD' /dev/disk0s2 which should give Initialized /dev/rdisk0s2 as a case-insensitive HFS Plus volume I then had to use Disk Utility to Erase it to OS Extended (Journaled) and after that I was able to install Mavericks via download. Any suggestions on fixing this? Could the HDD be broken? EDIT: Thanks to for the solution: Open Terminal from the Recovery screen. When I try to remove the partition it just gets stuck endlessly on 'Preparing to remove partition'. I've tried starting from the system recovery thing, and it can't reinstall Mavericks because of a disk error, and if I use the Disk Utility it detects errors on the drive but is unable to repair them. ![]() The HDD is a 750GB one that isn't the original one. The Windows 8 partition however has been booting just fine for months now. The OS X partition doesn't boot, it goes to a progress bar that never finishes. I've had this problem for a while, I have an OS X partition and a Bootcamp partition on my old MacBook Pro (2009). ![]() Fill, sign, and send PDF forms Say goodbye to paper forms. Instead, type responses on your PDF form. Inside Reader, you can subscribe to activate additional capabilities to create PDF files and export them to Word or Excel. It will scan all System Files and Registry Keys that have been damaged by security threats.Ĭonvert PDFs to Word Additional Adobe Document Cloud services are just a click away. Reimage - a patented specialized Mac OS X repair program. Mac Could Not Unmount For Repair Rating: 5,8/10 1053 votes ![]()
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