The performance of Samsung 1TBQVO SSD drops obviously after it is full. But what is a full plate? Is there enough room left for 20G?

Generally, when SSD is used more than 80%, the speed will gradually decrease, and when it is written more than 90%, it will seriously decrease.

After conversion, the performance of 1TB SSD will gradually decrease when there is 200G left, and will seriously decrease when there is 100G left. The performance of the remaining 20G must be the speed after a serious decline, which is normal.

And your Samsung SSD is QLC flash memory, which can be said to be the worst flash memory at present, and the slowdown will be more serious than TLC and MLC products.