1 The hard disk has a small arm that can move from ring to ring on the surface of the disk. To reach a particular sector, the hard disk moves the arm to the right ring and waits for the sector to spin into position.  Hard disks are slow in computer terms.
Chester William Nimitz, Sr. (/ËnÉªmÉªts/; February 24, 1885 â February 20, 1966) was a fleet admiral of the United States Navy.
Chester is one of the best preserved walled cities in Britain. It has a number of medieval buildings, but some of the black-and-white buildings within the city centre are Victorian restorations. Apart from a 100-metre (330 ft) section, the listed Grade I walls are almost complete.