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.
(chÄsh`Ér) , county, W central England, on the N border with Wales. The county seat was Chester Chester,city (1991 pop. 80,154), Cheshire West and Chester, W central England, on a sandstone height above the Dee River.It is a railroad junction. Manufactures include electrical equipment, paint, and window panes.Tourism is also important......he county seat was Chester Chester,city (1991 pop. 80,154), Cheshire West and Chester, W central England, on a sandstone height above the Dee River. It is a railroad junction.