4000 SX  (250-4900)            IDE Connectors           Faxback Doc. # 1530

Integrated Drive Electronics (IDE) let you install up to two hard drives 
without having to buy and install a hard drive controller adapter. Although 
the IDE system requires IDE-type hard drives, an IDE drive can function the 
same as a standard ST-506 type hard drive. If you choose not to use the IDE 
system and to install a different type of hard drive system, such as ESDI or
ST-506, you will need to change a dip switch setting on the main logic board 
so that the new hard drive controller adapter can take over.