SAMSUNG 850 EVO MZ-M5E120BW 120GB mSATA internal SSD

120 GB mSATA drive for compact systems

The Samsung 850 EVO MZ-M5E120BW is a 120 GB internal SSD built for ultra-thin laptops and small-form-factor PCs. Its mSATA form factor fits slots where 2.5-inch drives cannot. 3D NAND memory and an MGX controller deliver solid everyday performance for boot, applications and light workloads.

SATA III throughput ceiling

The drive connects through a SATA III interface, so sequential speeds cannot exceed the bus limit of roughly 6 Gbit/s. In practice that caps maximum sequential read at 540 MBps and maximum sequential write at 520 MBps regardless of the NAND or controller capability. Random 4 KB performance reaches 95,000 IOPS read and 88,000 IOPS write within the same constraint.

120 GB capacity decides suitability

With 120 GB of usable space the drive suits a single operating system, core applications and a modest working set. It will not hold large media libraries or multiple virtual machines without external storage. Buyers needing more room should select a higher-capacity model; the interface and form factor remain identical.