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12-25-2015, 09:50 PM
IBM in the early 1950's developed the RAMAC which is Random Access Method of Accounting and Control...
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12-25-2015, 09:54 PM
The RAMAC stood about 6 ft tall, I forget how much it weighed, but you figure it was about the size of a commercial refridgrator..
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12-25-2015, 09:54 PM
The RAMAC contained 50 discs and used one actuator arm to read and write data...
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12-25-2015, 09:55 PM
The RAMAC could store approximately 5 MB...
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12-25-2015, 09:56 PM
To store data the RAMAC used 7-bit words with 1 parity bit (for error detection) and used one bit between words...
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12-25-2015, 09:57 PM
Later IBM developed hard disk drives that were smaller and much larger in capacity...IBM was also the first to create hard disks that took advantage of floating heads....
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12-25-2015, 09:58 PM
This is called air bearing...the air flow caused from the spinning of the disks actually causes the heads to float...
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12-26-2015, 03:58 AM
Not those kinds of heads lol
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12-26-2015, 04:02 AM
That would freak me out if I started seeing floating heads...
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