![]() Visit us at our official website to know more about our professional macbook data recovery services. With the team of IT professionals, we always assure up to 100% recovery success rates. No logical or physical failure can render your data inaccessible when Techchef is always ready with professionals and dedicated tools. ![]() Click First Aid at the top menu to verify the disk. While restarting, hold down the Option key button and choose the attached boot drive. Connect the USB boot drive to your Mac, then reboot. Volume cannot be resized, Check if the partition scheme is set to GUID. Techchef as an IT leader, providing the most precise and exceptional data care solutions with a wide range of customized solutions for corrupted, damaged or failed Macbook data recovery solutions. Solution 1: Use a USB Boot Drive to Repair the Hard Drive. unmount force /dev/diskX, where X is the disk number. diskutil eraseDisk free Empty /dev/diskX. Then you can resize you OSX partition in Disk Utility to use the full disk. As the name implies, this does a simple erase of the disk and marks the free space as 'empty' with no file system or partition scheme. To save trying to identify exactly what you do and dont have Id urge you to read up on gParted Using the information on that site and creating a liveCD boot disk will let you boot your Mac from the disc, delete the unwanted partition and then reboot into Mac. Macbook data loss? Not a big deal for techchef There are a few steps you can take, but all are destructive to the data on the device. To protect your files from Mac hard drive data loss, create updated backup data always to access your files. We can not predict when the hard drive can be encountered with errors. With professional skill sets and dedicated tools, complicated, hard drive problems can be resolved. When all Mac solutions fail to eradicate the error “couldn’t unmount disk”, get your Mac hard drive recovered by a professional. Start with “terminal application”>input “diskutil list” line, and a list of disks on Mac will show up>choose target disk to force unmount>input “sudo diskutil unmountDisk force /dev/disk” with correct disk number. Command lineĬommand-line in Mac can also prove to be a helpful solution when you need to eliminate this error. Start with mounting the drive on Mac and reboot it>while booting, hold the “option” key and select “attached boot drive”>in the boot menu, select “Disk utility”>go to “first aid” and check the disk>do the task on the original disk. ![]() You can boot a Mac on another drive which can be a USB drive too. Use a USB boot drive when the error occurs in the drive that has modified the boot drive. Reboot Mac>while booting press “option” key and select recovery partition> use disk utility from boot menu> select “first aid” or format the disk. Macinto9e3bfb3c:~ howardhonig$ diskutil listĢ: Apple_HFS Macintosh HD 999.3 GB disk0s2ģ: Apple_Boot Recovery HD 650.Taking the case when this error message appears during “first aid” or non-boot disk, you can remove it with a recovery partition. Thanks.Įxample of what I've tried in Terminal. I've tried to unmount the entire disk as well as the individual partitions. I've tried to unmount through disk utility as well as through Terminal. Disk Utility states the disk needs to be repaired, but when I try to repair the disk, "unable to unmount for repair" is stated. I can see the drive in Finder, but some times the folders appear to be empty of files, and sometimes I can see the files but cannot access. I cannot transfer files to/from this hard drive anymore, and Time Machine will no longer work. I have a 2010 iMac with a 1.5 TB Seagate external hard drive I use for Time Machine as well as other backups. I'm having a problem unmounting an external hard drive. I know this conversation seems to be close, but thought I'd try to post here.
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