Need help to reformat the disk drive

Hi Guys,
I have a Powerbook G4 and I am trying to reformat my hard drive to be case insensitive instead of sensitive. The only problem is I don't have my installation disks. Is there any way i can reformat it without the disks? And if I do need a c.d. rom where can I get one?
Need help!!!
Thanks

Just to be sure . . .
You are aware that reformatting will erase the drive, right?
So if you want to keep any data, you'll have to figure out how?

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