Acer Altos R520 M2 Series User Manual page 64

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5 Install the HDD carrier into the drive bay.
(1) With the lever still extended, slide the HDD carrier all the way
into the drive bay.
(2) Use the lever to push the HDD carrier until it locks into place,
then close the HDD carrier lever.
(3) Lock the HDD carrier.
6 Observe the post-installation instructions described on page 36.
3 System upgrade