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Changing the SCSI target ID of a disk from a Sun SPARC station 4 or 5


The disk included in a Sun SPARC Station 4 or 5 answers to SCSI target ID 3, and there are no jumpers on it to change this configuration. Hence, if you want to add such a disk in another Sun SPARC Station that already contains one, there is a conflict because both disks have the same target ID.


  • First of all, you need to find the model of your disk. this is usually written on a label placed on the back side of the disk. Here, the model is Quantum Fireball 1080. Then, you have to find the technical datasheet of this disk (by submitting the model of the disk as a query to you prefered search engine on the Web, for example). You can see here the one corresponding to our model.
  • On this data sheet, you will find the location of the target ID jumpers (A0, A1 and A2). On Sun disks, the pins for these jumpers are often not present, but the connectors are present on the disk board. You can hence mimic the presence of a jumper by wiring the correponding connectors (A0 & A2 in our example).
  • In order to see these connectors, you usually first have to remove the screws that fix the plastic piece surrounding the disk (see picture).
  • More precisely, it is possible to change the target ID from 3 to 5 by wiring the two connectors corresponding to jumpers A0 & A2. This can be done by soldering them (see picture).
  • Then, you only have to install the disk on one of the SCSI connectors of your SPARC Station, and to install the new disk. You can check that your manipulation has effectively changed the target ID by entering the boot prom monitor (press STOP-A during boot) and type probe-scsi. It should display the target IDs of all the SCSI devices of your system.


This solution is given without any warranty of success, nor warranty of inocuity for your material.

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