![]() A drive that is 80% full will still read and write at the rated sequential speed within the pSLC cache once it recovers. These charts do not mean that after writing however much data they write, that it will be their permanent write performance at that fill point, or after you filled the cache once. This means that an empty 1TB drive may have a 140-300GB write cache, but when it is 80% full, it may only have 50-60GB of dynamic cache, or a static 6-24GB cache at that point. On SSDs with dynamic pSLC caches, their cache size will get smaller as you fill the drive with data, and those with static caches will continue to have their static SLC cache available, which should be obvious, but it hasn’t been to some. This also only affects write performance, read performance will remain the rated spec basically infinitely. This only takes a few minutes and can be in the tens of minutes on QLC NAND flash-based drives. When performing this extended write test, the SSD will degrade to its slowest speed after the pSLC cache is filled, but once this test finishes, the pSLC write cache will free up again after the data folds over from the pSLC programmed cells to native TLC cells. ![]() ![]() Over the years reading through forum posts and talking with people, there seems to be some confusion about how the SSD slows down and how the pSLC operates. Also, I specifically want to point out one detail here.
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