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.
manta rays are distinctive flattened body fish closely related to sharks many people believe that manta rays are any round and flat animal but the truth is that this is not so there are only two species of fish that receive the name of manta ray and belong to the genus manta being considered the biggest members of the ray family these are the reef manta manta alfredi and the giant manta ray manta birostris animals that exceed 3 meters wide and have the largest brains of all fish