ThinkSystem 2U Rear 4 x 3.5" SAS/SATA Backplane Option Kit
The option package contains the following items.

1 3.5" SAS/SATA 4-bay F/M/R backplane (1) + 2U rear 4 x 3.5" SATA/SAS HDD kit (1)
2 1 x 1 3.5" HDD filler (4)
3 1 FH riser filler (2)
4 Top cover support bracket (1)
5 Drive sequence label (1)
Option installation
To install the option, refer to:
For the latest technical information including firmware and driver downloads, go to Lenovo Data Center Support.