[sdilley14]

I'm wondering how I go about taking a dmg I have on my hard drive, putting it on my external, and booting from that dmg on my external. I'm sorry if this has been covered before. I'm really unfamiliar with this type of stuff so any help would be greatly appreciated!

[Big Mac]

Restore tab in Disk Utility. It will erase whatever is on the destination volume and put the DMG in its place.

[sdilley14]

Hmmm. Is there perhaps any way to do it without erasing the destination drive. I'm trying to update to Tiger on one of my old machines and all I have is the DMG of it from old my old disc and I just want to upgrade it rather than erasing the whole thing and starting over fresh.

[sdilley14]

NM, figured it out.

[SSharon]

Originally Posted by sdilley14 

NM, figured it out.

How did you do it? (aside from burning the dmg to a disk and booting from that)

[Big Mac]

Oh, in that case you use Migration Assistant. People say it works with any local volume, including disk images.

[sdilley14]

In short . . .

Partitioned the external HD. I set aside a 10gb partition for the dmg and used the rest to back up my system. After backing up my system on the 100gb partition, I went into Disk Utility, went to my 10gb partition, hit 'Restore', then selected the dmg on my internal hd as the source and the 10gb partition as the destination. After restoring that partition with the dmg, I simply restarted the computer, held down alt/option, selected to boot from the 10gb partition, then it walked me through the install from there. Surprisingly it went without a hitch. Be aware though that when you partition the external hd initially it will erase everything, so you'll have to set up the partitions, back up your system, then go ahead with the install.