Hard disk drive speed

Computer hard disk was first introduced in 1956 by
Ibm model 350 disk file
Largest hard drive in the world

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Reynold Johnson

Reynold Johnson was born in 1906 in Minnesota. He attended the University of Minnesota, achieving his BS in education administration in 1929. He then began teaching science and math at a local high school.

His life changed in 1933 when he lost his teaching job and began developing an idea he had for an electromechanical device for automatically marking and grading pencil-marked multiple choice tests. One of the companies he attempted to interest was IBM, which initially refused the design. But in 1934, the company reassessed the machine and saw Johnson's great potential. They offered him a position as an engineer at their Columbia University and Endicott laboratories in New York.

Johnson became one of the company’s most prolific inventors, specializing in electromechanical devices. The company became aware of a growing need for improved data storage systems in the early 1950s and asked Johnson to lead a research team in Silicon Valley to work on this project. In 1952, he assembled the team, which began examining magnetic disk storage systems. IBM asked the

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History of hard disk drives

Main article: Hard disk drive

In 1953, IBM recognized the immediate application for what it termed a "Random Access File" having high capacity and rapid random access at a relatively low cost.^[1] After considering technologies such as wire matrices, rod arrays, drums, drum arrays, etc.,^[1] the engineers at IBM's San Jose California laboratory invented the hard disk drive.^[2] The disk drive created a new level in the computer data hierarchy, then termed Random Access Storage but today known as secondary storage, less expensive and slower than main memory (then typically drums and later core memory) but faster and more expensive than tape drives.^[3]

The commercial usage of hard disk drives (HDD) began in 1957, with the shipment of a production IBM 305 RAMAC system including IBM Model 350 disk storage.^[4] US Patent 3,503,060 issued March 24, 1970, and arising from the IBM RAMAC program is generally considered to be the fundamental patent for disk drives.^[5]

Each generation of disk drives r

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Cannot access files on damaged Hard disk

wilkinsit (Wilkins IT Solutions) 1

I have already been through the forums and tried many things, i need some fresh ideas. here is the story:

I have this customer’s laptop which they dropped on Friday and the Windows OS went belly up. You get a blue screen when it tries to load windows. The hard drive can be detected in BIOS and the system reserved and the “recovery” partition can be seen when you connect the drive either via SATA or USB to another machine. The main partition cannot be seen and Disk management either says it needs to be formatted or shows nothing and hangs. I have UBCD which I ran a chk disk like program and the drive is riddled with bad sectors. I am trying to recover the persons auto-biography which they haven’t backed up in 6 months.

Within UBCD there is EaseUS disk copy which ran for 48 hours and recovered 2GB out of the 500GB and then I stopped it and moved on. I tried parted magic (also on UBCD) to recover the partition, i got the partition to be recognized in Linux (through parted magic and slax) and the dri