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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 10: The Small Computer System Interface, SCSI
      9  RAID
           9  RAID Basics

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Error Correcting Code (ECC) and XOR
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Parity

Parity is a method by which a check bit is added to data so that errors can be detected. Computer data is organized into bytes that consist of 8 bits. These bits a re transmitted serially as 1's and 0's. The simplest form of parity is referred to as Even Parity or Odd Parity. This method adds an ad-ditional bit to each byte to indicate whether the number of 1's in the byte is an even or odd number. If the number of bits received does not match the parity bit, an error is indicated. This simple parity check can only detect er-rors. It cannot correct them. The only way to correct the error is to retransmit the data. Error correction requires more sophisticated calcula-tions or additional bits to provide data transmission that is protected and recoverable.


Previous Topic/Section
RAID Basics
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Pages in Current Topic/Section
1
Next Page
Error Correcting Code (ECC) and XOR
Next Topic/Section

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