Western Digital Red SA500 4TB 2.5" SATA SSD + Paperback Book $603.51 Delivered @ Amazon US via AU

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WDS400T1R0A

Read up to 560MB/s, Write up to 530MB/s, 95K/82K Random R/W IOPS, Endurance 2500TB TBW, 2M Hour MTBF
Storage optimized for caching in NAS systems to rapidly access your most frequently used files
Superior endurance can handle the heavy read and write loads demanded by NAS, giving you the reliability you need in a 24/7 environment

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Controller: Marvell 88SS1074
Memory: SanDisk TLC
DRAM Cache: Micron DDR3
Sequential Read: 560 MB/s
Sequential Write: 530 MB/s
Random Read: 95,000 IOPS
Random Write: 82,000 IOPS
Endurance (TBW): 2500 TB
Warranty: 5 Years