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Rectangular 2.5 inch SSD with black metal casing and Samsung branding

SAMSUNG

SAMSUNG 850 PRO MZ-7KE256BW 256GB 2.5" SATA internal SSD

SKU CH-QE9Z-RGA2D MPN MZ-7KE256BW

A 2.5 inch SATA internal SSD with 256GB capacity, 3D NAND flash, up to 550 MBps read and 520 MBps write speeds, and a 2,000,000 hour MTBF

  • Total capacity256 GB
  • Sequential read speedUp to 550 MB/s
  • Sequential write speedUp to 520 MB/s
  • Interface typeSATA III
  • Form factor2.5 in (6.35 cm)
  • Product typeInternal Solid State Drive (SSD)

Model 256GB 850 PRO

  • World's first consumer 3D V-NAND technology for breakthrough density
  • Sequential reads up to 550 MBps and writes up to 520 MBps
  • Random performance reaches 100,000 read IOPS and 90,000 write IOPS
  • MTBF of 2,000,000 hours ensures long-term reliability
  • Low 0.5 W idle and 3.5 W active power consumption

256GB 3D V-NAND SATA SSD

The Samsung 850 PRO MZ-7KE256BW is a 2.5 inch internal solid state drive built for consumer laptops and desktops. It uses 3D V-NAND flash memory and a Samsung MEX controller to deliver up to 550 MBps sequential read and 520 MBps sequential write speeds. The drive targets users who need reliable storage for everyday computing tasks.

Sustained workload behaviour

Under continuous operation the drive draws 3.5W active power and maintains performance within a 0°C to 70°C operating range. Its 3D V-NAND structure provides enhanced endurance rated at 2,000,000 hours MTBF. Random read reaches 100,000 IOPS and random write reaches 90,000 IOPS during extended mixed workloads.

SATA III interface limits

The SATA III interface caps maximum sequential throughput at the stated 550 MBps read and 520 MBps write figures. This bottleneck defines the practical ceiling for large file transfers regardless of the 3D V-NAND capabilities. The drive remains compatible with standard 2.5 inch SATA bays in most current systems.

How it compares

Measured against everything we stock in Internal NVMe & SATA SSDs, at today’s prices. Recalculated every night.

Price $134.99
Cheaper than about 62% of the 1,994 comparable items (median $180.49).
Total capacity 256 GB
Lower than about 80% of the 1,368 comparable items (median 1 TB).
Sequential read speed Up to 550 MB/s
Lower than about 70% of the 1,180 comparable items (median 2,400 MB/s).
Price per TB $527.30 per TB
Pricier than about 88% of the 1,362 comparable items (median $165.50 per TB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSAMSUNG
Product line850 PRO
Model nameMZ-7KE256BW
Total capacity256 GB
Product typeInternal Solid State Drive (SSD)
Intended useConsumer
Performance
Sequential read speedUp to 550 MB/s
Sequential write speedUp to 520 MB/s
Random read (4K)Up to 100,000 IOPS
Random write (4K)Up to 90,000 IOPS
Storage
NAND flash type3D NAND
Controller chipSamsung MEX Controller
Ports & slots
Interface typeSATA III
Power
Idle power draw0.5 W
Active power draw3.5 W
Size & build
Form factor2.5 in (6.35 cm)
Overall height7 mm
Overall width70.1 mm
Product depth100.08 mm
Product weight0.14 lb (0.06 kg)
Shipping weight0.12 kg
Package size150 × 145 × 18 mm
Environment & compliance
Operating temperature range0 °C to 70 °C
Storage temperature range-40 °C to 85 °C
Operating humidity range0% to 95%
Max shock tolerance1500G
Vibration tolerance20G
More details
Mean time between failures2,000,000 h

Other versions of this model

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Questions about this item

How much power does the 850 PRO draw when it runs continuously in a desktop?

The drive draws 0.5 W at idle and 3.5 W during active use, so all-day operation adds only a few watts to the system.

What must my motherboard provide for this 2.5" SATA drive to work?

A standard SATA data port and a SATA power connector from the power supply.

Will the 850 PRO run at full speed if my older board only has SATA II ports?

The drive is backward compatible, but sequential reads will be limited to the SATA II port's maximum bandwidth.

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