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- Description
- Specifications
4XB7A13654 is the ThinkSystem 2.5" PM1645 1.6TB Mainstream SAS 12Gb hot-swap SSD, Lenovo feature code B4A1. It pairs Samsung NAND with a 12 Gbps SAS interface that supports full-duplex transfers and active-active dual-port connectivity, and it suits mixed read-write workloads. The 1.6 TB capacity is specified for 3 drive writes per day over 5 years, or 8,760 TB of total bytes written.
Lenovo specifies 230,000 random read IOPS and 90,000 random write IOPS at 4 KB blocks, 1,000 MBps sequential read and 1,200 MBps sequential write at 128 KB, and random latency of 106 µs for reads and 60 µs for writes. Typical power is 9 W for both reads and writes and MTBF is 2,000,000 hours. Samsung power-loss protection, S.M.A.R.T. support and end-to-end data protection are included, and the drive complies with SAS-3.
Lenovo supports it in the ThinkSystem SD530, SN550, SN850, SR530, SR550, SR570, SR590, SR630, SR650, SR670, SR850, SR850P, SR860, SR950 and ST550. Lenovo has withdrawn the PM1645 from marketing. A newer Samsung PM1645a-based option is 4XB7A17065.
| Part number | 4XB7A13654 |
| Feature code | B4A1 |
| Capacity | 1.6 TB |
| Form factor | 2.5-inch hot-swap |
| Interface | 12 Gbps SAS, active-active dual port |
| Flash | Samsung NAND |
| Endurance | 3 DWPD, 8,760 TB written |
| Random IOPS (4 KB) | 230,000 read / 90,000 write |
| Sequential (128 KB) | 1,000 MBps read / 1,200 MBps write |
| Random latency | 106 µs read / 60 µs write |
| Typical power | 9 W read / 9 W write |
| MTBF | 2,000,000 hours |
| Shock, non-operating | 1,500 G at 0.5 ms |