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.
Lydia Darragh (1729 â December 28, 1789) was an American woman said to have crossed British lines during the British occupation of Philadelphia, Pennsylvania during the American Revolutionary War, delivering information to George Washington and the Continental Army that warned them of a pending British attack.[2] Contemporary sources claim Darragh ...