di-a-b-ee-t-u-s-s
All of you pronounce it the correct way, you're just spelling it diffrently.
Diabee-t-US doesn't sound like Diabee-t-EESAnyway, Die-Uh-Bee-Tees
The actual correct way is dy-uh-bee-tees.
http://www.youtube.com/watch?v=s4LyaNgzy6U