Jick,
I'm not sure of this, but not all hard drives work with different products. I know for a fact that many drives do not work in the Yamaha keyboards. When I need to buy a hard drive, I sometimes have to try several before a Generalmusic WK6 will work with specific drives. I've only ever used the Solton sold drives in my X4's in the store, and there is no special cables required or modifications.The solton drive is I beleive a 1.1 or 2.1 GB drive and I don't remember what brand they are using but I don't think it is Toshiba. Sorry I couldn't be more help. You could call Bell/Solton in New York for help. ask for John.
George Kaye