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.
Various explanations exist for how it was coined. Tice Davids was a Kentucky slave who successfully escaped to Ohio in 1831, and the term âUnderground Railroadâ may have been coined based on his escape. His owner had been pursuing Davids but lost track of him in Ohio.