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 of the electric rays is Atlantic torpedo (Torpedo nobiliana). This fish can measure 1.8 m (5.9 ft) long and weigh 90 kg (200 lb). However, a length of 0.6â1.5 m (2.0â4.9 ft) and weight of 30 pounds (14 kg) is more typical.