Acer Altos easyStore M2 User Manual page 269

(4) Install the HDD carrier.
[1] With the lever still extended, slide the carrier all the way
into the drive bay.
[2] Use the lever to push the carrier until it docks into place,
then close the lever.
[3] Close the door of the storage system.
2 Add the HDD to a linear or normal RAID configuration.
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