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4.0TB Evo 850 Solid-State Drive

2.5-Inch | SATA 6.0Gb/s
Powered by Samsung V-NAND Technology
Optimized for everyday computing performance
Unlock Your Computer's Potential
Samsung's 850 EVO series SSD is the industry's #1 best-selling SSD and is perfect for everyday computing. Powered by Samsung's V-NAND technology, the 850 EVO transforms the everyday computing experience with optimized performance and endurance. Designed to fit desktop PCs, laptops, and ultrabooks, the 850 EVO comes in a wide range of capacities and form factors.
Uncompromised Performance
The 850 EVO optimizes performance for your daily computing tasks, boasting sequential write speeds up to 520 MB/s with TurboWrite technology and sequential read speeds up to 540 MB/s. Plus, RAPID mode to further boost performance for up to 2x faster** data processing speeds by utilizing unused PC memory as cache storage.

1.0TB SSD 850 EVO Series Specifications:


Form Factor
2.5" SATA
SATA 6Gb/s
Formatted Capacity2
Samsung MEX Controller


Height (max)
7.0mm (0.28″)
Weight (typical)
54g (0.12 lbs.)


MTBF (Mean Time Between Failures)
2,000,000 hours
5 Year Samsung Warranty


Sequential Read (up to)
Sequential Write (up to)
Random Read
Up to 98,000 IOPS
Random Write
Up to 90,000 IOPS


Maximum Start Current, DC
5V ± 5%
Seek Power
0.045 Watts

Environmental (Operating)

Ambient Temperature (°F)
32°F to 140°F
Ambient Temperature (°C)
0°C to 60°C
-304.8 m to 3,048 m (-1,000 ft to 10,000+ ft)

Environmental (Non-Operating)

-304.8 m to 12,192 m (-1000 ft to 40,000+ ft)


Idle (Typical)
0.0 bels
Seek (Typical)
0.0 bels
  1. 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences.
  2. In terms of standard gigabytes, 1GiB ≈ 1.074GB and refers to the actual formatted capacity of shown under Mac OS 10.5 or earlier and Microsoft Windows OS.
  3. Specific application environments such as temperature and duty cycle will affect the overall reliability rates.
Manufacturer provided specifications for Samsung p/n MZ-75E4T0B/AM UPC#: 887276123950


The best warranty is one you never have to use - but should the need occur - we're proud to provide a superior level of support and service coverage to our customers.

90 Day OWC Replacement Warranty
OWC is proud to offer an extended replacement window of 90 days on new internal hard disk drives. Once a return authorization number has been issued and we receive the problematic drive back, you will get a brand new replacement drive, rather than a factory refurbished drive.

5 Year Samsung Warranty
After 90 days, the drive is fully backed by the manufacturer to be free from defects in material and workmanship for the remainder of the five year warranty period.
Samsung 4.0TB Evo 850 Hard Disk Drive Mfr P/N: MZ-75E4T0B/AM OWC SKU: SAMMZ75E4T0BAM SATA Revision 6.0 6Gb/s (3.0Gb/s & 1.5Gb/s backwards compatible)
2.5-inch Solid-State Drive.
Samsung 5 Year Limited Warranty
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