Original sentence: Since flash drives wear out after a finite (though very large) number of writes, ReadyBoost will eventually wear out the drive it uses
Edited sentence: As capacities and speed rise and cost per megabyte drops, USB drives are increasingly suitable for ReadyBoost.Since flash drives wear out after a finite (though very large) number of writes, ReadyBoost will eventually wear out the drive it uses – though this may take a long time, depending on various factors.Since some older USB flash drives have fallen out of use for practical applications, an abundance of them can be repurposed for ReadyBoost so as to get more use until the end of the service life