Hey to format ANY HDD using Slayers all I do is pop in the HDD then load the slayers disk is that all? Then of course follow onscreen directions?

Yup, Just Pop It In And Select Format HD.

cool thanks

One more thing I have a fragging XBOX, it reboots everytime you turn it on (Failed audio font exploit) If I format a original XBOX HDD (unlocked) using slayers would it run in the fragginf XBOX? I know Ill prolly have to do something else? I dont know what though.

A fragging box hasn't got as far a looking for a hard drive. Its fragging 'cause it can't load a bios.
You'll need to fix the fragging before anything else.

if the bios isn't modded to boot unsigned code you can't use slayers anyway- e.g. you can't put slayers into a unmodded xbox or a xbox with a botched bios