IBM System x3650 M5 - Page 220

– Connect to the 3.5-inch HDD hot-swap backplane with 12 HDDs from
the rear hard drive backplane
SAS signal cable
3.5" hard disk drive cage Raid adapter
Figure 136. 3.5-inch rear two hard-disk-drive kit cable routing
204 System x3650 M5 Type 5462: Installation and Service Guide