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what is a sector in harddisk drive?

4 Answers

  • 10 years ago
    Favorite Answer


    Hard-disks are virtually partitioned in sectors. So that it can recogonize the space available to store data and the location to pickup data from a particular sector.

    It is a mandatory process to use a hard disk. A new hard disk is not partitioned in sectors.

    When you create a partition on you disk like C: or D: etc., It is not partitioned in sectors, and at that time you cannot use the hard disk unless you format the same. This formatting process produces sectors on hard disk platters, not physically but virtually. Each sector is composed of some bytes and data is stored in those sectors on the hard disk.


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  • Karl
    Lv 6
    10 years ago

    Each platter in a HDD is formatted in tracks, like a CD, starting from the inside and stepping out incrementally.

    each track is divided into sectors,

    The sector is a portion of the track that holds a specific amount of data and depending on the location of the track determines the number of sectors in that track.

    When data is written to the disk, it will start writing the data in a sector on a track and continue writing to each sequential sector until all the data has been stored. If the last sector that is written to does not fill the sector, the remainder is left empty. The next file will begin writing in the next available empty sector on that track or the next track out.

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  • 10 years ago

    Computer hard-disk is divided into tracks and sectors.

    Hard-disk is a circular disc and tracks are concentric circles on the disc starting from the center of the disc.

    The sector is angular section of the disc and each sector is comprise of same number of tracks. You can visualize it like a piece of pizza when cut. That means it is shaped like a slice of a pie.

    Each sector stores a fixed amount of data. When you format the hard-disk typically each sector will be 512 bytes (for magnetic disks) or 2048 bytes (for optical discs).

    Some sectors are reserved for system data and the store user data can be stored on the rest.

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  • 10 years ago

    A sector is the basic unit of data storage on a hard disk

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