I was there, trying to help a friend of mine make his MCP a bit less sluggish, and I thought it could be fragmented a lot after 3 years of use (he had fill it up a few times). So, I went on booting off the Leopard DVD, backup the internal drive into one dmg on an external drive. Finished after 2 hours, verified, ok. Then I erase the internal one, and start restoring the dmg on the usb drive, to the the internal disk. Everything ok, but at about 1/3 of its way, disk utility freezes(!). I hit the power off, and on again, boots into the dvd, trying the same restoration for a second time. And then, it gives me an error that the volume in the dmg is not valid! What do u mean not valid? I just made it! I hook up the external to my iMac, I see the dmg I made, get info, its 176MBs! s**t!!! The dmg should be something about 85Gbs! Naturally, I freak out, I start all the recovery apps I could find, nothing! 100Gbs vanished into oblivion! Just whaaaat happened here? I mean, to my knowledge and experience, that's not even possible! how can disk utility freeze and then replace my dmg with an almost empty one?!