Learn about the sizes and shape of discs that can be used in the CD-ROM, DVD-ROM, CD-RW, Combo and SuperDrives in various Macintosh computers. Drive mechanisms Many optical media are available in unusual sizes and shapes. Your computer's optical drive mechanism may or may not be able to accept discs of a nonstandard size and shape. Drive mechanism Standard discs Nonstandard discs Slot loading Yes No
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