Lenovo System x3650 M5 Installation And Service Manual page 224

3.5" hard disk drive cage Raid adapter
SAS signal cable
Figure 153. 3.5-inch rear two hard-disk-drive kit cable routing
– Connect to the 3.5-inch HDD hot-swap backplane with 12 HDDs from the rear hard drive
backplane
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Lenovo System x3650 M5 Installation and Service Guide