Lenovo System x3250 M5 Installation And Service Manual page 52

Figure 26. 2.5-inch simple-swap hard disk drive with ServeRAID SAS/SATA controller cable connection
(hardware RAID card inserted on the left side)
If you have more than four 2.5-inch simple-swap hard disk drives, connect the cables as follows:
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Lenovo System x3250 M5Installation and Service Guide