Compaq EP Series - Manual (Page 95)

4-52 Removal and Replacement Procedures
7. Rotate the drives 90 degrees, then reinstall them into the drive bays.
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The diskette drive should always be placed in the bay nearest the top of the
chassis in the desktop configuration for proper drive clearance and access.
Installing a Drive in the Desktop Configuration
CAUTION: The use of unnecessary force may result in damage to the drives.