Synology DX513 User Manual page 13

5 Press the handle in flush with the front panel to hold the drive tray in place.
6 Insert the drive tray key into the drive tray lock, turn the key clockwise to lock
the handle of the drive tray, and then remove the key.
7 Repeat the steps above to assemble the other drives you have prepared.
8 Drives are numbered as shown below.
Note: If you want to create a RAID volume, we recommend all installed drives be
the same size in order to optimize drive capacity usage.
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