Hmmm or you could give them better information, Ok for a start the bios isnt saved onto hard drive like you seemed to mention. And the only thing you really need on that new hard drive are the original M$dash files. Now i did hear that they are available at 'the usual places', but im not entirely sure. Secondly i dont think your xbox would FRAG becuase of the lack of files on your hard drive... so it seems like youve got another problem there. another thing is that you can use slayers to get those files as they are on the slayers disk... if you manage to sort you xbox out and install the hard drive, which i assume is unlocked, i strongly recommend slayers disk. and you may also want to reconsider putting a bigger hard drive in the xbox than 20gb. you might want to install something like 80gb.
You dont mention anything about what modchip you are using, is your xbox even modded?