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Unformatted text preview: sectors, and each sector has the same number of bits. The blocks of data nearer the center are just more densely packed. The actual number of tracks per surface and the number of sectors per track vary, but 512 bytes or 1024 bytes are common. (The power of two strikes again.) The location of the tracks and sectors are marked magnetically when a disk is formatted; they are not physically part of the disk. The read/write head in a disk drive is positioned on an arm that moves from one track to another. An input/output instruction specifies the track and sector. When the read/write head is over the proper track, it waits...
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- Fall '10