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Digital Technology - Hard Disks, typical desktop machine has between 10-40 gb, How Hard Disks Work CAPACITY & PERFORMANCE typical desktop machine, hard platter holds magnetic medium, How Hard Disks Work ADVANTAGES OVER CASSETTE TAPES recording, recording read/write head "flies" over the disk w/o touching, How Hard Disks Work ADVANTAGES OVER CASSETTE TAPES browsing, How Hard Disks Work CAPACITY & PERFORMANCE measure performance, magnetic recording material is high-precision aluminum/glass disk, magnetic medium can be easily erased and rewritten, measure performance two ways seek time