Samsung has added a 1TB option to its 850 Pro SSD line-up, which now includes 128GB, 256GB, 512GB and 1TB models. As with the 840 Pro, the drives are sold without any space reserved for over provisioning, a segment of the SSD that is usually reserved to improve longevity and performance.
The main advantage of SSDs over mechanical hard disks is performance - but storage companies currently face a challenging problem. The SATA bus imposes a hard limit on the maximum possible sequential transfer rates. No matter how good the underlying technology, no SATA storage device can go faster than 6Gb/s. Even then, that's only a theoretical speed, and real-world performance is less.
Performance:
Samsung claims that the 512GB 850 Pro can deliver 550MB/s sequential read speeds and 520MB/s sequential write speeds. In its documentation, the company further claims 100,000 IOPS during random 4K reads and 90,000 IOPS during writes.
With the 128GB 850 Pro, the sequential write speed drops to 470 MB/s, which is expected from smaller capacity SSDs, although it's an improvement over the 128GB 840 Pro model, which only managed 390 MB/s.
In Crystal Disk Mark, the sequential results confirmed Samsung's claims - exactly 550 MB/s reading and 525 MB/s writing.
IOPS (input/output operations per second) is a better indicator of storage performance than sequential speed, as it better shows the performance when writing small files. In daily use, a computer will spend more time reading and writing small files than large ones.
Samsung claims that the 512GB 850 Pro can deliver 550MB/s sequential read speeds and 520MB/s sequential write speeds. In its documentation, the company further claims 100,000 IOPS during random 4K reads and 90,000 IOPS during writes.
With the 128GB 850 Pro, the sequential write speed drops to 470 MB/s, which is expected from smaller capacity SSDs, although it's an improvement over the 128GB 840 Pro model, which only managed 390 MB/s.
In Crystal Disk Mark, the sequential results confirmed Samsung's claims - exactly 550 MB/s reading and 525 MB/s writing.
IOPS (input/output operations per second) is a better indicator of storage performance than sequential speed, as it better shows the performance when writing small files. In daily use, a computer will spend more time reading and writing small files than large ones.
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