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Technology

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The major difference between the two most common standards used by personal computers is the location of the information used by the drive for timing and access operations. 

Apple has traditionally used an encoding method called Group Coded Recordings (GCR) on its disks. MS-DOS machines use the Modified Frequency Modulation (MFM) method on its disks. 




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Locations of Data and Timing Information


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Apple Macintosh SE/30