[sgroup] S-750 hard drive?

Hi everybody, I read that the S-750 was just basically an S-770 with lesser A/D converters and no internal hard drive. Wondering if I could just add an internal hard drive to my S-750, I opened it up yesterday. Couldn't find any place for a hard drive, though. Also it looked like there was a place on the S-750 mainboard for a 50-pin internal SCSI connector, without any connector soldered on. So I guess there is also no actual fixture in the S-750 for the hard drive to go, eh? I didn't fully disassemble the thing, but in peeking around, I did see that the lower board (with the audio outputs on it) does say "S-770" on the PCB. The upper board says S-750 though. Thanks Tim