I'm running 2x1TB in RAID 0, so Samsung Magician doesn't let me enable RAPID mode, it just says it's unsupported. And yeah, I never run them near full, usually about 200-300GB are completely free.

Besides, RAPID mode seems to destroy performance if you care about number of operations per second(and I do very much, I'm writing millions of files to the drive every day)

http://techreport.com/review/25282/a-closer-look-at-rapid-dr...