Can´t unmount original HD, after update to SSD

[Andre C.]

Hello everyone.

I hope you can give me a hand with a little issue I´m having.

I have a late 2009 iMac 27" i7. I replaced the Superdrive with an 850 EVO SSD (boot drive). Everything is working great so far. Great speed improvement and I managed to keep my Superdrive in an external USB enclosure.

I left my original HD in place, but would like to format it completely to store files, music, etc.

Even though I´m booted from the SSD, I can´t seem to be able to unmount it and format it clean.

Forcing the unmount in terminal doesn´t work either.

I just want a clean, empty drive...

Any ideas?..

Thank you.

 

[fa8362]

Hi,

Perhaps I'm misunderstanding you ("unmount"), but why don't you just highlight the disc and erase it?

 

[Andre C.]

Hi fa8362

I can´t do that because it has a Recovery Partition. This was the original boot volume of the iMac before the upgrade to an SSD. It can´t be unmounted.

I actually managed to solve the issue by rebooting into the Recovery Partition and then using Disk Utility to format from there.

Now I have my SSD (in place of the Superdrive) as the boot disk, and the original Macintosh HD as just an empty drive.

I´m going to partition the drive so I have one partition as a backup to the SSD (via Carbon Copy Cloner), and the rest of the space to keep my files and music.

Thanks