Lenovo ThinkCentre M55 - Manual (Page 14)

5. Press the cover-release button on the right side cover, slide the cover to the
rear, and remove.
6. When the hard disk drive mounting bracket 1 is in position, access to some
of the components inside the chassis is restricted. It can be easily removed for
better access.
See “Removing the hard disk drive mounting bracket” on page 7.
To replace the computer cover, see “Completing the installation” on page 34.
6 Hardware Replacement Guide