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I have a Hard Disk 20SC external SCSI drive enclosure that has a SCSI ID selector switch on back. Because I am using a non-stock IBM DGHS 4.5GB drive inside, I've left the SCSI ID select switch cable disconnected. But I am eager to change the SCSI ID on the fly. Here's a photo of the drive label, showing the SCSI ID jumper settings: I believe the precise jumper settings follow what is shown on page 17 of this PDF. And here's a photo of the inside of my HD20SC (a still image from my PSU recapping video): It seems that an ST-225N was the stock drive and its SCSI ID jumpers seem to correspond to that blue connector in my above photo: What I am curious about is how the HD20SC's SCSI ID selector cable works. I haven't yet torn apart my HD20SC to figure it out myself. I will do that, but I wanted to post here first. The above ST-225N diagram shows 4 pairs of pins that can be shorted to select SCSI ID, but the drive enclosure's blue connector only has a 6-wire cable, meaning it could only control 3 pairs, not 4. Any thoughts?