CalDigit HDPro Rackmount Kit - Manual (Page 7)

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9. Open the HDPro's rear gate, then place the HDPro Internal Disk label
along the right side of the internal wall. (See the following picture)
Make sure the hard drive positions are correct.
10. When the installation is complete, your HDPro will look like this.
(See the following picture) Please keep the original parts with the
extra screws.