Quote Originally Posted by factotum View Post
The figure I've seen is that they have to get to 75% used before their performance starts to degrade, and it isn't anything to do with cache, it's to do with not having as much space available for the wear levelling algorithms to do their job.
According to this How-To Geek article, it's due to reading 4KB Pages and erased in 256KB blocks. But yeah, point is, it still happens.