Dell PowerEdge R900 - Manual (Page 159)

Jumpers and Connectors 159
Figure 6-4. SAS Backplane Connectors: 3.5-inch x5 Option (Front)
1 SATA_MODULE 2 CDROM
3 Fans (right) 4 Hard disk 4
5 Hard disk 3 6 Fans (left)
7 Hard disk 2 8 Hard disk 1
9 Hard disk 0 10 Control panel
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1 2 3