I'm trying to reformat my hard drive (only have one) and it won't let me b/c the os is on the hard drive. I tried creating a start-up disk with Windows XP so that I could boot to DOS and format from a ...

Apple's computers are available with a generous amount of hard drive space, from 256 GB all the way to 8 TB on high-end models. While that may be plenty of space for most users, video editing, ...