

IDE Disk Jumper Definitions
Quantum IDE disk drives have multiple jumper setting options and are used to set specific drive features. The most common
settings are used to define the drive as the primary or secondary drive on the IDE cable. [Master / Slave] Quantum IDE
drives have additional jumper settings used for optional features found on the drive. Listed below are the various jumper
options that may be found on Quantum IDE drives and the corresponding feature that they enable.
- DS Jumper - Drive Select
- Used to identify the drive as the primary [MASTER] drive in a single or dual drive configuration. This is the factory
default setting.
- SP Jumper - Slave Present
- Used only when the second [SLAVE] drive in a two drive configuration does not support DASP. DASP (Drive
active / drive 1 present) is a CAM (Common Access Method) defined signal that indicates the presence of a second
drive, DASP is used during power on initialization and after a reset. Prior to this definition, products were introduced
which did not utilize this method to detect the presence of a second drive. The SP jumper is used on the MASTER
drive, with the DS jumper, when the second drive does not support DASP.
- CS Jumper - Cable Select
- Only used in systems that support the cable select feature. Cable Select allows for each IDE disk drive to be jumped
the same and the position on the cable determines the ID. This requires a special cable and both drives on the interface
would have to support this feature.
- PK Jumper - Park [Spare]
- This jumper does not enable any feature. It is used, instead, to provide a spare location to any jumper removed from
the drive during a configuration change.
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