07 External Memory - MetaLab

Data Organization and Formatting• The head is a samall device capable of readingfrom or writing to a portion of the platterrotating beneath it.• Data are organize on the platter in a concentricset of rings called track.• Each track is the same width as the head.• Gaps- separate the adjacent tracks.• Data are transferred to and from the disk insectors.• Sectors can be fixed-length or variable length.