2.  Any system-board switch or jumper block that is not shown in the illustrations in this document are 
reserved.
Drive backplates/backplanes
The illustrations in this section identify the connectors on the drive backplates/backplanes.
Following are the drive backplate/backplanes that are supported by this server: 
•  Simple-swap drive backplates 
– 
“3.5-inch simple-swap backplate (Bay 0-3)” on page 28
–  “3.5-inch simple-swap backplate (Bay 4-7 without optical disk drive)” on page 29
–  “3.5-inch simple-swap backplate (Bay 4-5 with optical disk drive)” on page 29
•  Hot-swap drive backplanes 
– 
“3.5-inch hot-swap backplane” on page 30
–  “2.5-inch hot-swap backplane” on page 30
3.5-inch simple-swap backplate (Bay 0-3)
Table 11.  3.5-inch simple-swap backplate (Bay 0-3)
Bay number in the lower drive cage
1  Signal/SATA connector  SATA 3
2  Signal/SATA connector  SATA 2 
3  Signal/SATA connector  SATA 1
4  Signal/SATA connector  SATA 0
28 ThinkSystem ST250 V2 Setup Guide