View Single Post
Old Jan 31, 11, 9:14 pm
  #42  
Loren Pechtel
FlyerTalk Evangelist
 
Join Date: Jun 2005
Posts: 34,702
Originally Posted by Landing Gear View Post
What does "TRIM" do?
The Achilles heel of SSDs is their terrible erase performance. They only can write fast if they are writing to a block (and their blocks are far bigger than a sector) that is completely zeroed.

What the TRIM command does is allows the OS to tell the drive what space can be zeroed even though it's part of the visible space. Without this the drive will in time get slow due to the need to erase blocks before writing. (This is *PARTIALLY* overcome by having a declared size smaller than the real size but TRIM does a far better job of handling this.)
Loren Pechtel is offline