HDI - Head to Disk Interference.
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Each side, or surface, of one hard drive platter is called a head. Windows Vista technology that supports a hybrid drive is called ready drive.
On a single platter this is called a track, on a stack of platters (or a double sided platter) the stack of tracks is called a cylinder.
Hard drives platter surface is highly sensitive to scratches. To prevent damage to the surface it is fixed.
In a hard drive, the read/write heads float on a cushion of air above the platter. This ensures that there is a tiny gap between the heads and the spinning platter, allowing the heads to read and write data without physically touching the surface of the disk.
i don't know what is the answer! sorry
Alens
a head actuator moves a gang of read/write head arm across the surface of the platter with critical precision
For a cube with edge length, L. Surface area = 6L2. Volume = L3. So ratio of Surface Area / Volume = 6 / L. Therefore, as the side length, L, increases, the ratio will decrease.
The Jovian planets are gas giants and have no surface.