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 County (Chesco) is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 498,886. The county seat is West Chester. Chester County was one of the three original Pennsylvania counties created by William Penn in 1682. It was named for Chester, England. Chester County is included in the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD Metropolitan Statistical Area.