Jump to content

SCSI ID Selector Switch on back of Hard Disk SC


Recommended Posts

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:

 

IBM DGHS 4.5GB Hard Drive Specs

 

 

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):

 

HD20SC_JDW.thumb.jpg.0c5cc34eb4e6dd240779197884ed2c67.jpg

 

 

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:

 

225n1.gif

 

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?

Link to post
Share on other sites

Now that I ponder the DGHS's jumper table a bit further, it seems that only 3 pairs of pins are jumpered in order to select SCSI ID's 1 to 7.  So it should be a simply matter of extending the wires of that Blue connector so it reaches the front of the drive.

Link to post
Share on other sites
  • 2 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...