Acer AR320 F1 - Manual (Page 45)

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3 Pull the HDD cover straight out of the drive bay.
4 Install the hard disk drive with carrier.
(1) Use the lever to push the HDD carrier in the empty bay until it
locks into place.
(2) Close the HDD carrier lever.
(3) Lock the HDD carrier.
5 Follow the same steps for installing additional hard disks.