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Early disk drives used very simple encoding schemes, such as RLL (0,1) FM code, followed by RLL (1,3) MFM code which were widely used in [[hard disk drive]]s until the mid-1980s and are still used in digital optical discs such as [[CD]], [[DVD]], [[Minidisc|MD]], [[Hi-MD]] and [[Blu-ray]] using [[Eight-to-Fourteen Modulation|EFM]] and [[EFMPLus]] codes.<ref>{{Cite journal
|journal=IEEE
|volume=CE-41
|date=1995
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