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 largest living ray and one of the largest of all elasmobranchs , the giant manta ray (Manta birostris) is a stunning and graceful member of the devil ray family (Mobulidae). This giant fish is notable for its sheer size, with anecdotal reports of individuals measuring up to 9.1 metres across .