Acer Altos G540 M2 - Manual (Page 55)

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Configuring the hard drive
The two HDD cage bays of the Altos G540 M2 accommodates both
hot-plug and easy-swap HDD cage models. The main difference
between these two cage models is the presence of a backplane board
on the rear side of the hot-plug HDD cage. Both cage models support
up to four SATA2 or SAS hard disk drives.
The system ships out with only a single HDD cage occupying the top
cage bay. You have the option to purchase an extra HDD cage to
provide the system with additional storage capacity and scalability.
Contact your local Acer representative for more information.
The system supports 3.5” or 2.5” HDDs. It cannot support both at once.
If the systems ships with the 3.5” HDDs, then any additional HDDs
should also be the same size. That goes the same for the 2.5” HDDs.
Caution: You cannot mix 3.5” HDDs with 2.5” HDDs on the same
system.
Note: The HDD cage comes with HDD dummy covers. You need
to purchase a blank HDD carrier to install a hard drive.
Installing a 3.5“HDD cage
1 Perform the pre-installation instructions described on page 41.