Acer Altos R720 Series User Manual page 60

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6 Install a hard disk on the HDD carrier, then secure it with the four
screws (A) that came with the HDD carrier (B).
7 With the lever still extended, slide the HDD carrier all the way into
the drive bay (A). Do not push on the lever until it begins to close
by itself.
8 When the lever begins to close by itself, push on it to lock the drive
assembly into place (B).
3 System upgrade