Cable Select Jumper - Seagate ST34342A - Medalist 4.3 GB Hard Drive Installation Manual

Medalist 4342, 3232 and 2122, Rev. C 19

Cable select jumper

Some computers differentiate between master and slave drives
using specially designed interface cables that have the line to pin
28 (the Cable Select pin) removed or cut at one connector. The
connector that has pin 28 disabled is used for the slave drive.
See your computer manual to determine whether your computer
supports this feature. To configure your Seagate drive for cable
select, place a jumper, as shown, on pins 3 and 4.