The Jazz drive is a cartridge system.Each cart is seen as a hard drive with it's own rdb. The drive is about as fast as any of the Amiga hard drives I have had. The controller is the limiting factor in the Amigas. I have used them to boot the Amiga by setting the boot priority to the Jazz first. As long as a bootable disk is present it will boot whatever workbench I have on there. I had 3.1, 3.5 and 3.9 all on thier own disks. Did not increase my boot times noticeably.