the person who drives the train is called an engineer.
the person who drives the train is called an engineer.
the person who drives the train is called what?
engineer
the alignment pack was usually called the "ce pack," because ibm never called their 'service technicians' 'repairmen,' but "customer engineers" (ces). and, since the alignment pack was only to be used by ces, it was called the "ce pack." special ce media was also available for tape drives and diskette drives, known as "the ce tape" and "the ce floppy."









































later drives with exchangeable packs (such as the cdc 8" lark drives) embedded the servo with the data and didn't require regular head alignment.









































section::::see also.









































bullet::::- history of hard disk drives









































section::::references.
disk pack
before electric motors were invented, mechanical speed changers were used to control the mechanical power provided by water wheels and steam engines. when electric motors came into use, means of controlling their speed were developed almost immediately. today, various types of mechanical drives, hydraulic drives and electric drives compete with one another in the industrial drives market.









































section::::types of adjustable speed drives.:mechanical adjustable speed drives.









































there are two types of mechanical drives, variable pitch drives and traction drives.









































variable pitch drives are pulley and belt drives in which the pitch diameter of one or both pulleys can be adjusted.
adjustable-speed drive