Synology DS207+ Quick Installation Manual page 5

INSTALL HARD DISK
4
Pull up the upper case.
5
Place the hard disk connected with the shorter HDD Data Cable in the HDD bay. It will be disk No.1
(disk#1).
6
Fix disk#1 with the 4 HDD screws provided.
7
Place the other hard disk in the HDD bay. This disk will be disk No.2 (disk#2).