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Theoretically, you could end up with an SD card that writes and reads just as fast as an SSD. Some high-capacity drives opt for this as it offers much cheaper storage for archiving, but the block endurance rating of 1,000 write cycles can be punishing on computers using the drive for caching or swap/page file. Quad-level cell (QLC) – stores four bits, as you may have guessed.Although block endurance is significantly lower than in the other variants described above (3,000 write cycles on average), it’s more than enough for typical home use. This is actually the most common type of cell found on SSDs.
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Single-layer cell (SLC) – stores one bit per cell.This is important because differences in NAND flash almost entirely depend on how they are grouped into cells: For the SD format to work it just needs to be capable of communicating with the devices that read it. Additionally, although there are different types of NAND flash memory, each with its own disadvantages and advantages, you could theoretically move NAND transistors from an SSD (such as the 3D TLC NAND found in the Samsung SSD 850 EVO) into an SD card.