Acer AT350 F1 - Manual (Page 55)

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8 Insert the new 5.25-inch storage device with brackets into the
bay (1). The drive is properly inserted if you hear a click and the
locking tab locks into place.
9 Connect the power (2) and SATA cables (3) to their connectors on
the main board.
10 Re-install the side panel and close the bezel door.
11 Observe the post-installation instructions described on page 27.