The movement of the hard drive's read/write heads over different areas of the disk when accessing fragmented files is slower, compared to accessing the entire contents of a non-fragmented file sequentially without moving the read/write heads to seek other fragments.
The giant oceanic manta ray can grow to a disc size of up to 7 m (23 ft) with a weight of about 1,350 kg (2,980 lb) but average size commonly observed is 4.5 m (15 ft). It is dorsoventrally flattened and has large, triangular pectoral fins on either side of the disc.
When newborn, mantas weigh about 10 kg, but can reach up to 1200 - 1400 kg when adults. The largest individuals span over 6m between the tips of the pectoral fins. There is no sexual dimorphism, but females tend to be a little larger than males. The entire skeleton is cartilage, just like in sharks. Skin is rough.