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Q: reformatting laptop ("couldn't unmount disk")

hi all,

 

i gave my 2009 MBP to my mom and reformatted the disk. she didn't use it and i tried to reformat it so i had my name and ID on it and ended up having to bring it to the genius bar because i wasn't able to get the PARTITION tab to "un-grey out". turns out i had to OPTION BOOT into the recovery hard drive in order to reformat the user drive (or whatever this is called).

 

the problem is that i brought it home and it had a login password that i wasn't able to remember.

 

so i figured i would go in and REFORMAT by OPTION BOOTING into the recovery hard drive.

 

now when i go to the PARTITION tab i try to reformat to a single partition and i get a "couldn't unmount disk" error.

 

can anyone help me figure out how to get this drive back to a fresh install with no login so i can get working with it again?

 

thanks in advance

MacBook Pro, OS X Yosemite (10.10.5)

Posted on Mar 9, 2016 7:57 PM

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