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.
One of the adaptations is the Giant Manta Ray's size. Previous rays were much smaller than the modern day manta. The flattened shape of the ray however has stayed the same. The flat, disk shape body was an advantage for previous rays when searching for food, on the sea bed, as they could swim flat against the bottom.