• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint

Understanding Disk Drives

Actually, you must complete a few steps before you have a floppy disk drive. First, discard the record head. Because you are recording only the ones and zeros of binary numbers (the bits in a byte), you can simply record over previously recorded information. Because there are only two possible signals rather than varying shades of musical nuance, when you write a one or a zero, it effectively overwrites the previous character. You need only a single read/write head for each side of the disk, so your floppy disk needs two head assembly units to be double-sided.

You also need to record a formatting track to parallel or interweave with the data tracks so that a computer can say, “Record this group of bytes in this location and then read the bytes on that other location.” Provide internal programming on a ROM chip so that DOS only needs to send instructions to the disk drive to read and write data from any location at any time. Oh, yes, and hide all this complexity from computer users. Now you have invented the usable floppy disk!


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint