Lenovo IdeaCentre B520e Hardware Replacement Manual page 23

3. Spring up the handle on the hard disk drive bay, and then slide the hard disk
drive bay out of the chassis as shown.
4. Remove the 4 screws that secure the hard disk drive to the disk bay and slide
the defective hard disk drive out of the bay.
5. Install the new hard disk drive as follows:
(1) Slide the new hard disk drive into the drive bay.
(2) Screw the 4 screws back onto the drive bay.
6. Slide the hard disk drive bay back into position.
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Hardware Replacement Guide