Floppy disk & drive

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Floppy disk & drive

  1. 1. FLOPPY DISK & DRIVE ITS CONSTRUCTION & WORKING - M.K.DEVAKI
  2. 2. What is a floppy disk ?  A floppy disk, or diskette, is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles. They are read and written by a floppy disk drive (FDD).
  3. 3. Usage of Floppy Disk :  Floppy disks are used for emergency boots in systems lacking support for other bootable media, and for BIOS can still be executed from bootable floppy disks. If BIOS updates fail or become corrupt, floppy drives can sometimes be used to perform a recovery.  The floppy disk was the primary external writable storage device used.
  4. 4. Types of Floppy Disk :  According to the size, floppy disks are generally classified into two: • 5 .25 -inch diskette • 3 .5- inch diskette  A normal 3½ inch disk can store 1.44 megabytes of data.  Zip Drive  Zip drives were introduced by the Iomega corporation in the mid 1990s. A zip disk was capable of storing 100 megabytes, 250 megabytes and even 750 megabytes on a single disk. Zip drives were mainly available as a peripheral that could be added to an existing system.
  5. 5. Types of Floppy disk cont. Abbr. Floppy DiskType Capacity Info SS/SD or 1S/1D Single Sided, Single Density 100 K First generation. Capacity varies SS/DD or 1S/2D 5-1/4 inch Single Sided, Double Density 180 K DD/DD or 2D/2D 5-1/4 inch Double Sided, Double Density 360 K Most common type in the early 1980's DD/HD or 2D/HD 5-1/4 inch Double Sided, High Density 1.2 Mb DD 3.5 inch Micro Floppy, Double Density 720 K Hard plastic case HD 3.5 inch Micro Floppy, High Density 1.44 Mb or 2.88 Mb Hard plastic case
  6. 6. Floppy Disk Makers in 1980  Diskmakers included: Tandy, Memorex, Dysan, MicroUniversal, BASF, Datam, Verbatim(Datalife), 3M, Fuji Film, Janus, Maxell, Highland, NEC, Albinar, Businessland, Kodak, IBM, Sony, Precision, Packard Bell, and others.
  7. 7. Floppy Disk :
  8. 8. Floppy disk Construction  A floppy is made up of a circular thin Mylar plastic material coated with magnetic particles sealed into 90x94 mm plastic case. Every magnetic particles holds one data bit.  The Shutter with spring is present to avoid dust particles from being depostied.  Inserting inside the drive, the shutter opens allows magnetic media expose to Read / Write head.  Hub is a hole through which floppy disk is rotated by spindle or stepper motor.  Paper ring Clean the disk by removing microscopic bits of dust.
  9. 9. Floppy drive construction :  Made of ferrite type to make them electromagnetic.  Head contacts much closer compared to HDD due to low rpm [300 rpm]  3.5 Floppy disk has only 80 tracks per side so the actuator doesn’t need to be much precise as HDD.  Unlike HDD, FDD has 3 heads :  One is Read/Write head  And other two is tunnel –erase head to clean up after r/w head as there is a magnetization that overlaps two adjacent tracks while writing.
  10. 10. Working of Floppy disk drive : 1) Exposing the Recording Surface 2) Sending Signals From the Circuit Board 3) Checking for Write Protection 4) Positioning the Read/Write Heads 5) Writing the Data
  11. 11.  Disk presence switch is the mechanism called diskette changeline signal to form controller board that disk has been removed.
  12. 12. Floppy connectors :

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