Strict Standards: Non-static method AL_HELPER::SetupPaths() should not be called statically in /home/software/public_html/guides/init.php on line 66

Strict Standards: Non-static method AL_CATEGORY::GetCategoryArray() should not be called statically in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 82

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.categories.php on line 41

Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/includes/classes/class.article.php on line 273

Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 332

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/includes/classes/class.article.php on line 1039

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Deprecated: Function eregi() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 86

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Deprecated: Non-static method AL_HELPER::PageLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PageHeader.php on line 95

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Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 604

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Deprecated: Non-static method AL_HELPER::GetRelativeDate() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/includes/classes/class.article.php on line 515

Deprecated: Non-static method AL_HELPER::ShortDate() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 282

Deprecated: Non-static method AL_HELPER::GetCategoryListCVS() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 77

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Deprecated: Non-static method AL_HELPER::GetRatingBar() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 78

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 360

Deprecated: Non-static method AL_HELPER::ContentHasComment() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ViewArticlePanel.php on line 547

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Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 60

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Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 63

Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 68

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 68

Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/ArticleOptionsPanel.php on line 81

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Non-static method AL_HELPER::_SwapLetters() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 419

Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::ArticleLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularArticlesPanel.php on line 98

Deprecated: Non-static method AL_HELPER::_MakeArticleURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 453

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

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Deprecated: Function eregi_replace() is deprecated in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 421

Deprecated: Non-static method AL_HELPER::AuthorLink() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/templates/Bright Light/Panels/PopularAuthorsPanel.php on line 79

Deprecated: Non-static method AL_HELPER::_MakeURLSafe() should not be called statically, assuming $this from incompatible context in /home/software/public_html/guides/admin/includes/classes/class.helper.php on line 485
What is RAID?
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 »  Home  »  Computer Encyclopedia Page 2  »  What is RAID?
What is RAID?
Published  07/2/2011 | Computer Encyclopedia Page 2 | Unrated
What is RAID?

Redundant Array of Independent (mistakenly called Inexpensive sometimes) Disks is a scheme that allows multiple hard disks to be used to create a single unit with features better than what would be attained if they were not a unit. A “RAID controller” contains the circuitry to manage the disks as a single unit. There are different RAID schemes. The most popular ones are RAID 0, 1, 0+1 and 5.

RAID 0 allows Striping, a scheme where alternate blocks of data is written to different disks. This results in a direct doubling of the write / read speeds. The flip side is that if one of the disks fails, the entire data becomes inaccessible.

RAID 1 offers data redundancy by mirroring the data. In this scheme, the same data is written to both disks. While there is no improvement in performance, from the security standpoint, failure in one disk will not result in downtime, since the same data is mirrored on the other disk(s). Both the above-mentioned schemes require at least two hard disks to function.

RAID 0 + 1 brings together the benefits of both the schemes, and obviously requires a minimum of four hard disks to function. RAID 5 allows striping, but also stores the parity information of every operation, which can be used to recover data in case of failure. This scheme requires a minimum of three drives.

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