Now there are two types of SSD Solid-state drives (SSDs) based on flash memory: MLC SSD, and SLC SSD. TLC SSD and QLC SSD Generally, SSDs can provide faster transfer speed, higher reliability, and lower power consumption rather than HDDs.
- A. Based on Nand Flash
- SLC or Single Level Cell allows for the storage of one bit of information per NAND memory cell. SLC NAND offers relatively fast read and write capabilities, high endurance, and relatively simple error correction algorithms. SLC is typically the most expensive NAND technology. An SLC NAND Flash PE cycle is written as 100K times in its Datasheet while the read is unlimited. SLC drives are more suited for enterprise and digital recording systems environments because of frequently written operations.
- MLC or Multi-Level Cell, technology in general is less robust than SLC as there are two bits stored in each cell. If one cell is lost two bits will be lost. An MLC NAND Flash PE cycle is written between 3,000 to 5,000 times while the read is unlimited. The drives are usually available in larger capacities and are usually cost-effective. MLC-based SSDs are ideal storage devices for consumers and few write operation environments.
- TLC flash (triple-level cell flash) is a type of NAND flash memory that stores three bits of data per cell. TLC is also known as MLC-3, 3-bit MLC, and X3. … The 3D NAND enables higher storage densities at a lower cost per bit and improves the endurance of the flash.
- Quad-level cell (QLC) drives are the latest development of flash storage technology. As the name suggests, the technology stores four bits per cell. The way QLC flash and all other NAND flash stores data is essentially the same, using an electrical charge to determine whether each cell is a “0” or a “1”.
- Based on Host Interface
- SATA SSD: SATA SSDs are based on the industry-standard SATA interface.
- PCIe/ NVMe SSD: PCIe SSDs are based on the industry-standard PCIe/ NVMe interface.
- PATA 44PIN: PATA SSD based on the industry-standard IDE interface
