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).
Other animals that hunt and eat the animal. Characteristics unique to the animal. The manta ray is a large species of flattened fish, closely related to other cartilaginous fish such as sharks. The manta ray is the largest species of ray in the world with some manta ray individuals reaching up to 9 meters wide.