title: If I perform a write on an SSD that only changes 0s to 1s, can I rely on the drive not to erase the entire block before writing?
body: <p>It is my understanding that it is the erases that wear out SSDs, not the writes themselves. Therefore, optimizing away the need for erases would be hugely beneficial from the point of view of drive manufacturers. Can I take it as a given that they do this?</p>
  
  <p>I'd like you to assume that I'm writing directly to the disk and that there isn't a filesystem to mess things up.</p>