I assume you have an A4000D. Unfortunately you'll have to remove one of the TBCs cards as the Flyer card takes up two slots worth of space. You'll need the Octupus cable if you set up some kind of seperate SCSI box. Would recommend this route as the 3 extra HDs would put too much strain on the stock powersupply. Not to mention the heat generated by the Flyer, TBC and extra drives will cause problems.