Final answer:
The 'CS' jumper setting on an IDE drive indicates that the drive is configured to use 'Cable Select', where its role as master or slave is determined by its position on the IDE ribbon cable.
Step-by-step explanation:
When a jumper on an IDE drive is set to "CS", it stands for Cable Select. This setting is used to determine the role of the drive based on its position on the IDE ribbon cable. In a Cable Select setup, the drive's position on the cable will automatically set it as either a master or a slave. For example, the device at the end of the cable will typically become the master drive, while the one in the middle will be set as the slave drive. This configuration simplifies the process of setting up multiple drives, as you don't have to manually set master or slave jumpers on each individual drive.