"You know the thickness, tolerances of wood has to be exactly right for the right tone, and volume of a soundboard has to be measured exactly, and that's done mostly by ear.
VOA: standard.2010.07.06
As one tenth of the ice sits above the water, it is then possible to work out the overall volume and thickness of ice in that location.
Compared to the very first PS3 model with 60GB HDD, the internal volume as well as its thickness and weight are trimmed down to approximately two-thirds.