TX2550 M4 Upgrade and Maintenance Manual 213
Hard disk drive (HDD) / solid state drive (SSD)
7.4.1 Backplane overviews
Figure 130: 3.5-inch HDD SAS backplanes - rack model
Figure 131: 3.5-inch HDD SAS backplanes - floorstand model
1 SAS backplane 1 in HDD cage 1 (basic configuration)
2 SAS backplane 2 in HDD cage 2 (optional)
3 SAS backplane 3 in optional 4x 3.5-inch HDD extension box