ok but i dont have a copy of leopard.. or is the cds that came with my laptop a copy of leopard? how do i format it?
Disk 1 of the set that came with your machine is the bootable Leopard DVD.
Again: you will need a
full backup of your internal drive. Erasing it
WILL DELETE all your files. If you go with the iDefrag method, it's still a good idea to have the full backup.
Boot Camp's method (backup & restore):
The external drive needs to be partitioned using the GUID scheme. The partition itself needs to be formatted Mac OS Extended (journaled) (which is HFS+ journaled). To do this, boot up on your Leopard DVD and run Disk Utility (you'll be able to get to it after selecting the language).
To do the backup, run Disk Utility from your Leopard boot DVD. Use Disk Utility's Restore function to make the backup to an external drive/partition. Make sure to check "
erase destination" to enable block copy. It's much faster, and you want an exact copy of your drive.
The process will take a while (even an hour or two, depending on the size of the backup and interface used).
I would suggest,
before erasing your internal drive, to boot off your new external backup. It's just a quick way to verify you have a good clone of your internal. Just hold down the "option" key when starting up to select the external drive (that way, you aren't changing the default startup disk).
Once complete and you're satisfied with your backup, again use Disk Utility's Restore function -
reversing the source and destination volumes (again, check "
erase destination").
If you have any questions
prior to erasing your internal drive, please post back here before doing so. No one wants to see a mistake made when you only have a single copy of your data. (You really should have a Time Machine backup or at least a 2nd copy of your personal data on a 2nd drive.)