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 dorsal fins are small and at the base of the tail. The largest mantas can reach 1,350 kg (2,980 lb). In both species the width is approximately 2.2 times the length of the body; M. birostris reaches at least 7 m (23 ft) in width while M. alfredi reaches about 5.5 m (18 ft).
Oceanic mantas (M.birostris) are the bigger of the two manta species; reaching a wing span (thatâs wing tip to wing tip) of up to 7 metres (23ft)! A large oceanic manta might weigh in at up to 2 tonnes (4,440 lbs), making them a real ocean giant!