QNAP TS-453U - TS-431 U, TS-x31 XU series, TS-451 U, TS-x53 U, TS-x63 U series (4;8;12-bay)

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b. For 2.5” HDDs, follow the signs which are marked on the tray then secure the
three screws in the back of the hard drive tray
3. Insert the hard drive trays into the NAS all the way to the rear and push the lever back
until you hear a click.
7.1.2. TS-453Mini
1. Remove the case cover. Open and remove the hard drive tray.