Quote Originally Posted by lowfat View Post
This does not exist on the ioXtreme. You can only choose to do this w/ the SLC versions of the Fusion-io's.
TH was able to make a format with different size on IoXtreme as well.
http://www.tomshardware.com/reviews/...sd,2488-9.html
Maybe they just used Fio-format to specify a smaller size instead (i.e. there's no predefined setting).

Anyway, I found on FusionIo forum. The Improved Write Performance capacity is 50% of the max. and Maximum Write Performane is 25% of the max.! (i.e. if you format a 80GB IoDrive/IoXtreme for Improved Write Performance it will only provide 40GB usable space!)