Compaq EP Series Maintenance & Service Manual page 92

6. Rotate the drives 90 degrees, then reinstall them into the drive bays.
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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.
Compaq Deskpro EP Series of Personal Computers