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Block (Data Storage)

Block (Data Storage)


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About the Book

High Quality Content by WIKIPEDIA articles! In computing, a block is a sequence of bytes or bits, having a nominal length. Data thus structured are said to be blocked. The process of putting data into blocks is called blocking. Blocking is used to facilitate the handling of the data-stream by the computer program receiving the data. Blocked data are normally read a whole block at a time. Blocking is almost universally employed when storing data to 9-track magnetic tape, to rotating media such as floppy disks, hard disks, optical discs and to NAND flash memory. Most file systems are based on a block device, which is a level of abstraction for the hardware responsible for storing and retrieving specified blocks of data, though the block size in file systems may be a multiple of the physical block size. In classical file systems, a single block may only contain a part of a single file. This leads to space inefficiency due to internal fragmentation, since file lengths are often not multiples of block size, and thus the last block of files will remain partially empty. This will create slack space, which averages half a block per file.


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Product Details
  • ISBN-13: 9786132808721
  • Publisher: Alphascript Publishing
  • Publisher Imprint: Alphascript Publishing
  • Height: 152 mm
  • Weight: 218 gr
  • ISBN-10: 6132808728
  • Publisher Date: 12 Sep 2010
  • Binding: Paperback
  • Spine Width: 8 mm
  • Width: 229 mm


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