Sunday, September 18, 2011

A Quick History of Data Storage

By Jason Sloan


If you are an expert in hard drive recovery it is very important to have an appreciation of your history. Tracing the roots of our modern day small information storage media devices is an engrossing account of man's ingeniousness. What we have now would be called nothing apart from sci-fi by our forebears.

Our contemporaries can only go as far back as the cassette tape but little did we all know that there have been attempts made even before that, for effectual information storage devices. Like the clumsy, fumbling attempts of man to fly by way of balloons, the history or growth of info storage media is an account worth telling.

Selectron Tube

The Selectron tube was a 1ox3 inches information storage device which was devised in 1946 but never actually took off due to production issues. It was so long as an one-foot ruler and as thick as a large flashlight. It can hold only up to 32 to 512 bytes, which, with such cumbersome size and an estimated value of about $500 each, wouldn't have been cost effective to sell.

Punch Cards

Punch cards had been produced straight after the death of the Selectron tube but the underlying principle has been used for mechanised textile looms in the textile industry as far back as 1725. Punch cards were also employed in organs and other instruments and in some voting devises.

A punch card, true to its name, is a card or inflexible paper with holes or punches. Digital information is stored by the presence or absence of holes at predetermined positions.

Punched Tape

Similar to a punch card, the punched tape was an information storage device which is a roll of tape punched with holes. Its beginnings can also be traced to motorized looms. Each row on the tape has different configurations of punched holes which pertain to a single character. This may be used both to input info into early computers and also to output information.

Magnetic Drum Memory

This was literally a drum form of data storage device and wasn't in any way handy. For all its size, it could only hold 10 kilobytes but was utilized in the 1950's and 60's as the primary working memory of PCs. Later on magnetic drum memories of only 16 inches in length were made.

Hard Disk Drive

The 1st ever hard drive was the IBM Model 350 Disk File which came with the IBM PC in 1956. It was also big as it contained 50 pieces of 24-inch storage discs which together can hold about 5 million characters or only 5 MB. The 1st hard drive which could store 2 GB was developed in the 1980's but came in the size of a refrigerator and at a restrictive price of $80,000 to $140,000.

After these early sorts of data storage media came what we now recognize in our existing generation: the laser disc, the cassette tape and the floppy disks. Certainly, the history of data storage has come a long way and the technology behind it shows no indications of slowing yet.




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