Hard disk drive

                              HARD DISK DRIVE

“THE 1^ST MAGNETIC SLURRY COATING ON THE 1^ST DISK DRIVE WAS POURED ……FROM DIXIE CUP” 

                         Johnson and IBM gives computer users direct access to their data……

 Introduction                              

                               For most of the twentieth century, the primary medium for data entry, storage and processing was the punched card.in the 1930’s IBM hired teachers and inventor Reynold B. Johnson(1906-1998) to develop the IBM 805 test-scoring machine to convert pencil marks on forms in to punched cards.20 Years later, Johnson Led the team that developed the technology that made the vast majority of punched cards obsolete- The Hard Disk.

  Information                                                              

Finally Johnson and his team made a model hard disk but a main

problem was come out that was the read-write heads from hitting and damaging the disks. Jhonson and his team was solved the problem by supporting the heads on thin layer of air. Their 350 Disk Storage Unit, proudly unveiled by IBM in September 1956, held five megabytes of data on fifty 23 1\2-inch (60 cm) diameter platters rotating 20 times in a second. By modern standards, the disk drive was a crude device. 50 years later, IBM introduced the System Storage DS8000 Turbo, which could hold up to 320 terabytes (more than sixty million more than the IBM 350.

                                     Today We Use                                                                                        Today, people routinely take pictures with digital cameras, listen music or unlimited songs in one place that is I-pad, mobile phones etc. and watch long movies in computers, all of these depend sufficient digital storage.

                                           Worlds First HARD DISK DRIVE