Pesquisando um manual para alguns de seus utilitários do DOS , o que explica:
This software is designed to support SyQuest IDE drives connected to a generic IDE adapter, a SyQuest SQ08 IDE controller, SyQuest EZ135 PP drives and SyQuest EZFlyer PP drives ...
At the end of this file, there is a short description of the jumpers on the SyQuest internal IDE drive.
Portanto, parece que isso se aplicaria a um IDE EX135. No final:
Master/Slave jumper pins
This set of jumper pins is on one end of the jumper block and is marked as such. The drive is a master when a jumper is installed on the pins, slave otherwise.
You can connect one or two IDE drives to an IDE cable. If you have only one drive, it must be Master, if you have two, one must be master and the other must be slave.
System uses the master drive first. If you already have an IDE drive on the system, you need to find out how to configure it so that it will work with a slave SyQuest Drive.
All other sets must not be jumped.
Soa bastante normal. Isso corresponde ao que você vê na unidade?