Source : WordNet®

seek time
     n : (computer science) the time it takes for a read/write head
         to move to a specific data track

Source : Free On-Line Dictionary of Computing

seek time
     
         The time it takes for a {disk drive} to move its
        head(s) from one {track} to another.  The seek time depends on
        the power of the servo, the mass of the heads, the number of
        tracks traversed and the time taken to position the heads over
        the target track accurately enough to start data transfer.
     
        See also: {average seek time}, {minimum seek time}, {maximum
        seek time}.
     
        (1997-07-15)