While people would rarely choose to share their boots, its perfectly acceptable to share ones boot disk. Amongst your computers that is. After a series of unfortunate events surrounding my Mac OS X Leopard disc, I found that there are many ways you can get a fresh copy of OS X running on your Mac.
It started a few months ago when I got my new iMac. Long story short; it was a disaster, I got a new one, its a little off as well.. Anyways, it scratched my Leopard DVD. No problem though, I acquired a new image and tried to burn it to a double-layer DVD. Toast quit halfway through and seems to have toasted the DVD drive. The half-baked disc was stuck in my iMac and the drive isn’t recognized anymore. This pushed me to find a different way to install OS X, and I learned a lot in the process.
Booting from an External Hard Drive
Most people know you can boot almost any OS X capable Mac from a FireWire hard drive. All you have to do is restart the machine, and hold down the Option key until it shows you the list of bootable disks and click on it. Many people don’t know that all Intel Macs can also boot from USB hard drives. This means you can clone your internal HD to your external USB drive, and have a fully bootable backup whenever you need it. Its also possible to copy the OS X installation DVD to an external, boot from it and install (this method is faster than using the DVD). This takes us to the next possibility.
Booting from your iPod
I recently went on a house-call where an OS X reinstall was needed. Rather than carry around a bulky external HD, I stuck the OS X installation in a partition on my iPod video. Just like any other USB drive, its fully bootable (by Intel Macs) and be used to install OS X.
Leopard is Universally Bootable
But the system that needed a repair was PowerPC Mac mini. Uhoh. PPC Macs can boot from USB drives, right? Well that’s true, but if you install OS X 10.5 (Leopard) there’s a way to get around this problem. As long as you own or can borrow an Intel Mac you’ll be fine.
- Start the PPC Mac in Target Disk Mode. (Turning into an expensive, shiny FireWire HD)
- Plug the iPod or USB drive into the Intel Mac.
- Boot the Intel Mac holding down the Option key, boot from the USB drive containing OS X Install.
- Choose the PPC’s HD as the destination (you made need to change to use the GUID boot record).
- Install OS X as normal.
This fresh OS X Leopard install is universally bootable. That means it’ll run on either a PPC or Intel Mac. So after the install is complete and you restart the PPC computer, it’ll work just as if you installed it directly on that machine. This method is typically faster, and great if your PPC Mac doesn’t have a DVD drive (or doesn’t quite meet the requirements like my 800Mhz iMac G4). Its also worth noting that you can use Leopard recovery discs from one Mac to install OS X on the HD of another. Just follow the instructions as posted above, but the PPC Mac could also be another Intel Mac. For example, I used this method to reinstall Leopard on my MacBook and my iMac G4. I’m not sure about the licensing implications of this method. I own a Leopard family pack disc, its just scratched.
