Currently Being ModeratedApr 15, 2012 2:32 PM (in response to EHUBS)
You cannot erase the root drive if you are booted off it, you'll need to boot off your install DVD's or else the Lion recovery partition.
Once you are running off something other then the root drive you will be allowed to erase and partition it.
Currently Being ModeratedApr 15, 2012 2:34 PM (in response to EHUBS)
If you are using the internal drive as the boot volume, you can not erase it. It is impossible to erase the boot volume - the running OS will not suicide.
If that is the case, the solution is to boot the machine to a different volume - typically an installation disk, but can also be a different hard drive such as an external one. Once you are booted to a volume other than the one you want to erase, you can use Disk Utility to erase that volume.
Currently Being ModeratedApr 15, 2012 2:36 PM (in response to Frank Caggiano)
Thanks for the quikc response. I booted up in the Recovery Disk I believe. I held option at boot up and chose the recovery disk option. Is that the correct method?
I may have figured out what I was doing wrong. I was clicking on the parent hard drive reading "1 TB WDC WD1001Fals..." Now I've clicked on the next level hard drive "Macintosh HD" and I believe it is working.
Looks like 5 hours to erase...
Currently Being ModeratedSep 26, 2012 5:34 PM (in response to EHUBS)
I just encountered the same issue in Recovery mode. My question is why are the HDD's represented in two different ways? many times I've erased both, the root or parent representation of the drive, and e drive with a name we've given it. Curious what the nature of this is..