Going into details is outside the scope of this post, so just know that higher density cells have less endurance than low-density ones, e.g. NAND memory cells have only a finite number of program-erase (P/E) cycles (write cycles) before they wear out. QLC is still relatively new, but we expect its low costs will draw in buyers, especially since it is often pitched as an HDD replacement. TLC is now mainstream and holds the largest market share. The pursuit of cheaper and larger drives has caused the decline of SLC and MLC-based SSDs. This has led to the development of denser memory cells while slowly approaching (not yet there) the cost of traditional hard drives. Current industry trends are to reduce costs while increasing storage capacity. Since SSDs hit the market, capacities have grown larger and larger. Triple-level cell (TLC) contains three bits per cell, while quad-level cell (QLC) contains four bits per cell allowing for four times the capacity of SLC flash memory. Multi-level cell (MLC) doubles the capacity with two bits per cell. Single-level cell (SLC) flash memory contains one bit per cell. The number of bits stored on a cell determines the type of flash memory used. NAND flash memory data is represented as digital signals (bits) and stored on NAND flash memory cells. In today’s post, we’ll explore how NAND types affect performance significantly, and why this should matter to your next purchasing decision. Due to differences in how vendors test and rate their products, buying based off advertised numbers is not enough. We’ve also explained the differences between consumer and enterprise SSDs, and why for sustained performance reasons we suggest the latter.Ĭonsumer and enterprise SSDs are two broad categories that encompass a wide range of performance profiles.
We’ve talked about how we can use SSD cache to reduce latency and accelerate transfer speeds.
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