Compaq EP Series - Manual (Page 92)

Compaq Deskpro EP Series of Personal Computers 4-49
6. Rotate the drives 90 degrees, then reinstall them into the drive bays.
✎
The diskette drive should always be placed in bay number 3, the bay nearest the
internal 3.5-inch drives, for proper placement within the chassis.
Installing a Drive in the Minitower Configuration
CAUTION: The use of unnecessary force may result in damage to the drives.