Acer Altos G520 series User Manual page 58

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4 Insert the Hot Plug HDD cage into the housing (1), then tighten
the four thumbscrews to secure it to the chassis (2).
5 Attach the other end of these cables to the corresponding
connectors on the mainboard.
Refer to "Mainboard layout" on page 14 for the location of the
connectors.
6 Reinstall the air baffle and the chassis panels.
3 Upgrading the system