HGST s841 400GB 0T00183 Data Sheet

s841 SAS SSD

• 

cMLC NAND Flash for higher ROI while 

delivering high performance and endurance 

• 

6Gb/s SAS interface for maximum throughput 

• 

Advanced power loss data management 

technology

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Outperforms competitive SATA SSDs while 

delivering enterprise endurance 

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Cloud and Datacenters

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Enterprise-class servers and High 

Performance Computing  

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Space and/or power constrained 

environments

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Web servers 

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Video on demand, Streaming media

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Database acceleration/Archival storage

Accelerating access to data is a proven success formula for enterprises and service 

providers worldwide.
The s841SAS SSDs from HGST are engineered to take performance to new levels in the 

data center and eliminate data access bottlenecks.  The s841 delivers up to a massive 

industry-leading 2TB capacity, ideally suited for read-intensive applications, and also 

offers capacities for today’s sweet-spot, 800GB and 400GB. With sustained IOPs of up to 

83,200 read and 16,200 write, and maximum sequential throughput of 525MB/s read and 

395MB/s write, the s841 SSD enables rapid access to “hot” enterprise data for improved 

productivity and operational efficiency.

The s841 SSD combines commercial-grade MLC NAND flash memory, advanced endurance 

management firmware and power loss data management techniques to extend reliability, 

endurance and sustained performance over the life of the SSD.  With an MTBF rating of 2M 

hours, the 2TB model can endure an impressive 25PB of random writes over the life of the 

drive. HGST’s innovative CellCare™ technology is key to the s841 endurance success and 

extends the life of flash media to deliver enterprise-class endurance through advanced 

signal processing and adaptive flash management algorithms.
For complete data protection and reliability, the s841 incorporates extended error 

correction code (ECC), Secure Array of Flash Elements™ (SAFE) technology to protect 

against flash die failure and an exclusive power loss data management feature using 

super capacitors.  The s841 is also backed by a five-year limited warranty or the maximum 

petabytes (PB) written (based on capacity).

400/800/2000GB | cMLC

2.5-inch SFF | SAS 6Gb/s

Features and Benefits

SAS 6Gb/s

6G Active-Active Dual port for enhanced reliability

cMLC NAND flash memory

Consistent write performance and endurance

Up to 525/395 MB/s sequential R/W 

Maximum throughput and IOPs for ultra-fast access to data. 

Up to 83K / 30K IOPS random R/W

Significantly faster than typical HDD and SATA SSD drives

2000, 800, 400 GB capacity

More capacity for less space and power

2M Hours MTBF

Reduced field replacement effort

1E-17 bit error rate

Enhanced error detection and correction for optimal data integrity

Power loss data management

Assures data integrity during power failure

Unlimited reads, up to 25 PB writes (2000 GB)

Maximum endurance over the life of SSD 

HDD architecture commonality

Extensive interoperability and compliance testing