This is where the Option/Module guide comes in handy. RS11 - probably a suffix missing (either B,C, or D and an optional A) This is a HDA (hard disk assembly) for an RF11 drive which could have two such drives installed. A complete RF11 consists of RF11 + RSO8-M + RS09-M (yours is the RS09-M) --Chuck At 08:25 PM 5/23/99 -0700, you wrote: