Hardware question regarding Hard Disk..

5 pts.
Tags:
Hard drives
Partitioning
Partitions
Storage
Why we can create only a maximum of 4 primary partitions in a Hard Disk?

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See: http://www.pcguide.com/ref/hdd/file/structPartitions-c.html —- The limitation of four primary partitions is one that is imposed on the system by the way that the master boot record is structured.

See this also: http://en.kioskea.net/repar/partitio.php3

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  • Janderek
    The rules that determine how partitions are used were set down very early in the original design of the PC, and have remained virtually unchanged since that time. Recall that when the PC was first invented there was only (really) one type of file system. Still, it was envisioned that in the future, multiple operating systems and/or file systems might be wanted on a single machine. Therefore, provision was made in the partitioning scheme to allow for several different partitions. The rules that govern partition setup are as follows: A maximum of four partitions can be placed on any hard disk. These are sometimes called primary partitions. The limitation of four is one that is imposed on the system by the way that the master boot record is structured. Only one partition may be designated, at any given time, as active. That partition will be used for booting the system. See here for more on active partitions and switching active status between partitions. DOS (and the operating systems that depend on it for booting, which includes all consumer Windows operating systems) will only recognize the active primary partition. Any other primary partitions will be ignored. One of the four partitions may be designated as an extended DOS partition. This partition may then be subdivided into multiple logical partitions. This is the way that two or more logical DOS volumes can be placed on a single hard disk. To read more about this try looking here : http://www.techyv.com/questions/would-know-how-partition-my-hard-drive
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