These jumpers are required for proper configuration of the drive. The drive ships with the jumpers in the following locations:
Partial Back View of 4 GB IBM Drive (Model DFHSS4F)
+--------------------------------------------------------------...
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| Pin 1 Pin 9 Jumper Pins 25 and 26
| | | |
+-|-------|---------------|------------+-----+----------------...
| * * * * * * * * * * * * # * # * | | * * |
| * * * * * * * * * * * * # * # * | +-----+
+-|---------------------------|---+
| Jumper Block |
Pin 2 Jumper Pins 29 and 30
Note: * Pins 1,2, and 9 do not exist in 50 pin model.