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The TBW (Terabytes Written) rating represents the total amount of data that can be written to a solid-state drive (SSD) over its lifespan. QLC (Quad-Level Cell) NAND and TLC (Triple-Level Cell) NAND are both types of flash memory used in SSDs, but they have different characteristics that contribute to their respective TBW ratings.
The primary reason QLC NAND has a lower TBW rating compared to TLC NAND is its higher cell density. QLC NAND stores four bits of data per cell, while TLC NAND stores three bits per cell. The increased density allows QLC NAND to offer higher storage capacities at a lower cost per gigabyte, making it attractive for consumer SSDs. However, this higher density comes at the expense of endurance.
Each cell in NAND flash memory has a finite number of program/erase cycles it can endure before it starts to degrade. QLC NAND typically has a lower endurance than TLC NAND because it requires more precise voltage levels and higher voltage tolerances to differentiate between four different states in each cell. This increased complexity and narrower voltage margins make QLC NAND more susceptible to wear over time.
As a result, QLC NAND-based SSDs have lower TBW ratings compared to TLC NAND-based SSDs. The lower TBW rating indicates that QLC NAND can handle a lower total amount of data written before the drive reaches its specified endurance limit. However, it is worth noting that modern SSD controllers and advanced wear-leveling algorithms help mitigate endurance concerns and extend the lifespan of SSDs, even with QLC NAND.
In summary, QLC NAND's lower TBW rating compared to TLC NAND is primarily due to its higher cell density and the resulting reduced endurance caused by the increased complexity of storing four bits per cell.

I naravno, 143 SATA dram-less modela, uključujući "popularni" Crucial BX, izbjegavati u širokom luku jer SATA protokol ne podržava HMB.