Also, remember that hard disks are sold in base-10 SI units, so it doesn't make sense for Nautilus to use base-2 units (which it was doing in previous releases). Users were confused with base-2 units, with comments such as "Nautilus only shows 298GB available on my nice new shiny 320GB hard-disk. What's using the rest of the space?" being quite common.
Also, remember that hard disks are sold in base-10 SI units, so it doesn't make sense for Nautilus to use base-2 units (which it was doing in previous releases). Users were confused with base-2 units, with comments such as "Nautilus only shows 298GB available on my nice new shiny 320GB hard-disk. What's using the rest of the space?" being quite common.