Samsung 870 EVO 4TB SATA3 2.5inch SSD

Hard Drive

Samsung 870 EVO 4TB SATA3 2.5inch SSD Main Picture

Background on Solid State Drives

Solid-state drives (SSDs) store data electrically, rather than on magnetic disks like traditional hard drives (HDDs). This means there is virtually no delay when seeking a specific bit of data, and there is no physical limitation to how fast reading and writing of data can happen. Instead, the limits come down to the controller inside the drive, the speed at which the individual flash memory chips can transfer information, and the connection between the drive and the rest of the computer.

These drives are available in many physical forms: 2.5-inch (similar in size to laptop HDDs), PCI-Express (which slot into a system like a graphics card), and M.2 "sticks". The more traditionally shaped drives usually connect to motherboards via SATA, just like hard drives do, and that connection itself tends to be the limiting factor in their performance. M.2 drives can use either SATA or the much faster PCI-Express connection, depending on the drive itself and the motherboard it is installed in. There are also U.2 drives, which are close in size to the 2.5-inch models but use a much faster data connection; they are found more often in servers and datacenters than in desktop workstations.

Samsung's 870 EVO line of mainstream solid-state drives are affordable but high-quality SSDs designed to cover the needs of most computer users. They use a SATA III 6Gbps data connection, and are available in multiple capacities and form factors. This 4TB model is rated for sequential read speeds of up to 560MB/s with write speeds up to 530MB/s, in line with the maximum theoretical speeds for SATA III, but real-world speeds will be lower and depend heavily on the application in use.

Model: Samsung MZ-77E4T0E


Capacity 4,000 GB
Interface SATA 6 Gb/s
Cache Size 4096 MB
Form Factor 2.5 Inch
Endurance (TBW) 2,400 TBW
Net Weight 0.047 kg (0.1 lbs)
Sequential Read (Peak) 560 MB/s
Sequential Write (Peak) 530 MB/s
Random 4KB Read 98,000 IOPS
Random 4KB Write 88,000 IOPS