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.
The manta ray (Manta birostris) is the largest ray reaching up to 9 meters in width. This ray feeds on plankton and small fish and are completely harmless to humans. The common skate (Dipturus batis) is the largest skate in the world, reaching up to 250 cm in length with a life span of approximately 50 years.