Q: Can't restore the drive to 1 partition
Hi Everyone,
I got one MacBook 2008 with OS X Lion 10.7.5 recently. Wish to remove all previous system and install OS X Yosemite with USB drive.
I ran into a weird problem, and after searching for a week still can't figure out a solution.
When running the installer, I can't choose the drive to install because the drive are not GPT.
So, I want into Disk Utility. This is how the drive look like when I got the MacBook:
1. Mac part, running OS X Lion.
2. Win7 part, already removed Bootcamp and does't have any system in it.
3. Two gray areas, can't do anything with the options, it's greyed out.
I want to combined all areas into 1 partition, but getting this message:
"Partition failed with the error: Couldn't unmount disk."
Also in Disk Utility I cannot "erase free space", it's greyed out. I can't do anything.
I have tried all the methods as below:
1. Single User Mode, enter "fsck -fy" => appears to be OK.
2. Recovery Mode, Disk Utility => same result as above "Partition failed with the error: Couldn't unmount disk."
3. Recovery Mode, open terminal, command "diskutil cs list", appears "no corestorage logical volume groups found."
Then command "diskutil list", result as below.
None of them can solve my problem. What should I do to repair my drive?
Sorry for the poor descriptions, if I miss some informations, just ask
Thank you for the help!
MacBook, Mac OS X (10.7.5)
Posted on Jan 25, 2016 1:45 AM


