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Lenovo lists 4XB7A13635 (feature code B49N) as the ThinkSystem 2.5-inch S4610 960GB Mixed Use SATA 6Gb hot-swap SSD. The S4610 is an Intel data center SATA drive that Lenovo describes as tuned for mixed read-write performance, endurance and data protection.
The 960GB model is rated for 96,000 random read IOPS and 51,000 random write IOPS with 4 KB blocks, 560 MBps sequential read and 510 MBps sequential write. Sequential latency is 36 microseconds for reads and 37 for writes, and random write latency is 54 microseconds. Endurance is 3.4 drive writes per day, or 6.0 PB written, with typical active-write power of 3.0 W and an MTBF of 2,000,000 hours.
Neighbouring 2.5-inch S4610 capacities are 4XB7A13634 (480GB, B49M), 4XB7A13636 (1.92TB, B49P) and 4XB7A13637 (3.84TB, B49Q). The S4610 range also has a 7mm form factor at 240GB and 480GB, and 3.5-inch versions.
More Lenovo drives are in the Lenovo SSDs. For another 960GB SATA drive, see the ThinkSystem 2.5-inch 5300 960GB Mainstream SATA SSD, 4XB7A17089.
| Option part number | 4XB7A13635 |
| Feature code | B49N |
| Description | ThinkSystem 2.5" S4610 960GB Mixed Use SATA 6Gb HS SSD |
| Capacity | 960GB |
| Interface | 6 Gbps SATA |
| Form factor | 2.5-inch hot-swap |
| Endurance | 3.4 DWPD, 6.0 PB written |
| 4 KB random IOPS | 96,000 read / 51,000 write |
| Sequential rate | 560 MBps read / 510 MBps write |
| Typical active write power | 3.0 W |
| MTBF | 2,000,000 hours |