Acer Altos G540 M2 - Manual (Page 65)

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Installing an additional hard drive
The Altos G540 M2 HDD cage models supports both SATA2 and SAS
hard drives in different capacities.
Note: You cannot mix the 3.5” HDD with the 2.5” HDD on the
system.
To install 3.5” a hot-plug hard drive:
1 If necessary, unlock the front bezel, then pull it open.
2 Remove the HDD dummy cover from the cage.
3 Prepare the blank HDD carrier for installation.
(1) Remove the four screws that secures the blank frame.
You will use these screws to secure the hard disk later.