The new devices are Samsung's second generation of quad-level cell (QLC) flash drives, following the 860 QVO line released in 2018. Four models will be available, with capacity options including 1 TB, 2 TB, 4 TB and 8 TB. The upper end of that list is currently as high as consumer-level SSDs get – drives with dozens of terabytes are currently available for businesses and data centers, but they carry a premium price tag.
All four models of the 870 QVO drives have sequential read speeds of up to 560 MB/s, and write speeds of up to 530 MB/s. To keep write speeds as high and consistent as possible, Samsung says the SSDs use a technology called Intelligent TurboWrite, which can adjust the buffer size based on how much disk space is still usable. This can be up to 42 GB for the 1 TB model, and 78 GB for the other three.