T9740
The old 16 and 22 px drive-harddisk icons didn't look like hard drives. The new design for 16, 22 and 64 px is easier to resize and adapt. Symbols can be added to the light area on top of the 64px icon to show different types of drives (e.g., a globe for iSCSI). Also, not many people use IDE drives anymore, which the old 64px icon represents.