ASROCK 1U4LW Series User Manual page 20

Installing a 3.5" Hard Drive to the Hard Drive Tray
1. Place the 3.5" HDD into the tray with the printed circuit board side facing down.
Carefully align the mounting holes in the hard drive and the tray.
2. Secure the hard drive using the four screws.
3. Slide the drive tray into the HDD bay until the drive is fully seated.
4. Push in the locking lever to lock the HDD tray into place.
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