Hard Drives - Digital Space
- Date: 2010-10-03 - Word Count: 436
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The first hard drives (Hard Disk Drives, HDD) were developed by IBM in 1956. Since then the need for space to store digital information like music, videos, pictures and games has increased many times. While the space of the first hard drives was measured in tens of megabytes the newest models for home usage can reach up to 3 Terabytes which in converted in megabytes is 3,000,000 megabytes. Of course disk space isn't the only characteristic of hard drives, reading and writing speed is important too, as well as RPM for the noise levels. Of course newer hard drives are very quiet and won't bother you at all. The standard size of a desktop PC hard drive is 3.5" and for a laptop (mobile computer) it is 2.5" of course their size may vary from 1" to 8". The biggest 3.5" hard drive is 3 Terabytes and the biggest 2.5" hard drive is 320 Gigabytes. Of course disk space isn't the only characteristic of hard drives, reading and writing speed is important too, as well as RPM for the noise levels. Of course newer hard drives are very quiet and won't bother you at all. While the space of the first hard drives was measured in tens of megabytes the newest models for home usage can reach up to 3 Terabytes which in converted in megabytes is 3,000,000 megabytes.
Hard Drives consist of platters, heads, actuator axis, actuator arm, spindle and metal casing. The platter is basically a special disk on which data is magnetically recorded. The platters are made of a non-magnetic material which is usually aluminum and are covered with a thick 10-20nm layer of magnetic material. The magnetic material is usually cobalt-based alloy. The platters spin at high rates (5400 to 10000 RPM) and the read and writing heads installed on the actuator arm which is connected with the actuator axis, thus allowing the movement of the heads on the platters which by making contact with the platter write or erase the digital data.
Hard Drives can be connected to hard drive networks such as RAID, NAS, SAN which combine several hard drives in one. These networks appeared because of the need for greater space by big enterprises and web-sites, but of course you can also use it in your home if you need the space and possess the knowledge to do it.
Hard Drivers aren't used only in computers. Every digital video player, music player, camera or phone and others have a hard drive on which you can save your information - they're an important part for almost every piece of mechanical device we use occasionally.
Hard Drives consist of platters, heads, actuator axis, actuator arm, spindle and metal casing. The platter is basically a special disk on which data is magnetically recorded. The platters are made of a non-magnetic material which is usually aluminum and are covered with a thick 10-20nm layer of magnetic material. The magnetic material is usually cobalt-based alloy. The platters spin at high rates (5400 to 10000 RPM) and the read and writing heads installed on the actuator arm which is connected with the actuator axis, thus allowing the movement of the heads on the platters which by making contact with the platter write or erase the digital data.
Hard Drives can be connected to hard drive networks such as RAID, NAS, SAN which combine several hard drives in one. These networks appeared because of the need for greater space by big enterprises and web-sites, but of course you can also use it in your home if you need the space and possess the knowledge to do it.
Hard Drivers aren't used only in computers. Every digital video player, music player, camera or phone and others have a hard drive on which you can save your information - they're an important part for almost every piece of mechanical device we use occasionally.
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