However, these drive are rather rare. Configuration Floppy drives are bought off the shelf already configured for your computer. But sometimes, if you are installing a used drive, you may need to reconfigure it. This means that there is one cable leading from drive to drive. Therefore, like a SCSI daisy chain, each drive must have an ID number.
Some older drives allow four choices IDs.
However, modern PC floppy controllers can only support two floppy drives in a chain. The jumper that controls this is usually called the DS jumper, and the options are labeled DS0 and DS1. The numbers themselves may vary from drive to drive. When installing floppy drives, for the most part, you don't have to worry about this. This is done with the use of a special twist in the cable that electrically changes the DS configuration of the drive after the twist.