A draw-down menu, dropdown list, or dropdown box, a dropdown menu is just a menu that looks when hitting a text or switch selection. For Example, several applications possess a “Document” dropdown menu at the very top left of the screen. Hitting the “Document” text creates a brand new selection with additional options.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.