> copying zeroes is much less work Yes, reading "evicted" or "trimmed" space [0] specifically, is much less work - only flags are read, not actual media. [0]

> copying zeroes is much less work Yes, reading "evicted" or "trimmed" space [0] specifically, is much less work - only flags are read, not actual media. [0] https://en.wikipedia.org/wiki/Trim_(computing) https://en.wikipedia.org/wiki/Trim_(computing)