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.
Note: Giant Manta Rays are commonly referred to as the Atlantic manta ray. However some specialists recognize two other species of manta, known as the lesser devil rays, Manta hamiltoni (Pacific manta ray) and Manta alfredi (Prince Alfred's manta ray).