How to Make a Lion Partition from Mountain Lion?

Question

Level 2

250 points

How to Make a Lion Partition from Mountain Lion?

Mountain Lion broke Compressor 4.0.4. It has been suggested that I create a Lion partition on my hard drive. I know how to do this if I wanted to create a partition in Lion and then download Mountain Lion, but how would you do it in the other direction (Mountain Lion to Lion)?

I have a thumb drive with the Lion installer on it, I have created a partition, but my issue is trying to get Lion onto the partition. When I try to reboot the computer on the thumb drive with the Lion installer on it (holding down the Option key on reboot), the thumb drive does not appear...

Any help?!?

iMac, OS X Mountain Lion, i7 brand new

Posted on Aug 28, 2012 3:59 PM

Reply

Answer 1

Aug 28, 2012 4:02 PM in response to bikinijack

Did you format the flash drive as "GUID Partition Table" before putting the Lion installer on it? It needs to be in that format to be bootable.

Reply

Answer 2

Lanny

Level 6

13,235 points

Aug 28, 2012 4:04 PM in response to bikinijack

Merely copying the Lion installer to a thumb drive does not make it bootable.

See: http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from -a-usb-flash-drive/

Reply

Answer 3

bikinijack Author

Level 2

250 points

Aug 28, 2012 4:08 PM in response to Lanny

The thumbdrive is a GUID, I had used it before while in Lion, I can't get it to boot the computer in Mountain Lion. The way I am trying to get it to boot is to hold down the option key on restart, is there another way???

Reply

Answer 4

bikinijack Author

Level 2

250 points

Aug 28, 2012 4:10 PM in response to bikinijack

here is the info from the thumb drive

Disk Description : Kingston DataTraveler G3 Media
Total Capacity : 32.01 GB (32,006,733,824 Bytes)

Connection Bus : USB
Write Status : Read/Write

Connection Type : External
S.M.A.R.T. Status : Not Supported

USB Serial Number : 001CC0C60D83EAA0942B0349
Partition Map Scheme : GUID Partition Table

Reply

Answer 5

Imp68

Level 4

2,672 points

Aug 28, 2012 4:16 PM in response to bikinijack

Another way you could do it is with Internet recovery. Boot with opt/cmd/r and lion should be available there to install on the other partion. Down side is downloading it again.

Reply

Answer 6

Lanny

Level 6

13,235 points

Aug 28, 2012 5:09 PM in response to bikinijack

The thumbdrive is a GUID, I had used it before while in Lion, I can't get it to boot the computer in Mountain Lion. The way I am trying to get it to boot is to hold down the option key on restart, is there another way???

Follow the instructions that I gave you to make a bootable USB drive. Once again, merely copying the installation file to a USB drive doesn't make the USB drive bootable.

http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from -a-usb-flash-drive/

Reply