runlength-limited code
1Run length limited — or RLL coding is a technique that is used to store data on recordable media. Specifically, RLL prevents long stretches of repeated bits from causing the signal recorded on media to not change for an excessive period, by modulating the data. RLL… …
2Eight-to-Fourteen Modulation — (EFM) is a data encoding technique used by CDs and pre Hi MD MiniDiscs. EFM and EFMPlus were both invented by Kees A. Schouhamer Immink. Technological classification EFM [US patent|4,501,000, EFM Patent, applied in Compact Disc, CD R, MiniDisc.]… …
