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.
Births may take place only once every two to five years. The newborn giant manta ray measures an impressive 1.2 to 1.5 metres across, and may double in size during the first year of its life. The giant manta ray is believed to mature at a disc width of about 4 to 4.5 metres in males and 5 to 5.5 metres in females. This species is thought to be long-lived, with an estimated lifespan of at least 40 years.