Can't erase hard drive MacBook Pro - "could not disassemble the drive.

I lost my original install discs Mountain Lion. Spin a MacBook Pro (2011 model).

I found some articles that show you how to remove & reinstall everything without use of the physical disks. It is to restart my MacBook, pressing command-R, will using this toerase my hard drive and disk utilities

However, when I try to wipe my drive, this error message appears: "erase disc failed with the error: failed to unmount disk.»

I have attached a picture of the error that is displayed.

On the left side of the utility window of disc (see attachment), there where hard disks are displayed, it shows the drive of 500 GB Toshiba MK. Directly below is the option "Macintosh HD."

This error ONLY appears when I try to erase the disc from Toshiba. But this allowed me to erase the hard drive Macintosh option. Why is this? My drive was nonetheless erased? Or I still have to do something else?

Thanks in advance for any help on this matter.

Please check this thread: Erase disc failed with the error: failed to unmount the drive. Mavericks running

Tags: Notebooks

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