I wanted the same thing, but I ended up removing the floppy drive and installing an internal SCSI zip 100MB drive in it's place. NOTE: Before attempting the procedure below be sure to boot from an S-750 floppy disk and install the S-750 OS onto a blank ZIP disk BEFORE you remove the floppy drive or you won't be able to boot the S-750 from the zip drive. I routed a 25 pin SCSI cable from the SCSI connection on the back of the S-750 into the inside of the S-750. Depending on how precious your S-750 is to you, you can cut a notch in the enclosure on the top to allow for the cable, or just do like I did and screw the S-750's enclosure down over the cable. That bent the tin enclosure a little but it wasn't visible from the front. I then scavenged a cable from an old SCSI hard drive enclosure that had a 50 pin SCSI connector for a SCSI drive on one end, and the 25 pin SCSI connector on the other and connected up the zip drive. I also used the power connector for the floppy drive to power the zip drive. Remember to set the SCSI ID on the zip drive accordingly to avoid conflicts. The cabling looked like hell from the back, but it all worked. Andy At 5/11/2010 07:58 AM, t'byte wrote: 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