公开(公告)号：EP0680656A4

公开(公告)日：1996-12-27

申请号：EP94907269

申请日：1994-01-24

申请人： DISCOVISION ASS

发明人： KIMURA NOBORU ,  VITULLO RONALD G ,  YAMAZAKI YASUHIRO

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B19/00 ,  G11B19/02 ,  G11B19/12 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B20/18 ,  G11B27/30 ,  G11B5/09

CPC分类号： G11B27/3027 ,  G11B7/0045 ,  G11B7/00456 ,  G11B7/005 ,  G11B7/0079 ,  G11B7/013 ,  G11B7/126 ,  G11B11/10506 ,  G11B11/10513 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B19/00 ,  G11B19/02 ,  G11B19/12 ,  G11B20/10 ,  G11B20/10009 ,  G11B20/1258 ,  G11B20/1262 ,  G11B20/1426 ,  G11B20/1833 ,  G11B2007/0006 ,  G11B2020/1434 ,  G11B2220/2525

摘要： A first write encoder (418) encodes digital data in a first, high-density format. A second write encoder (416) encodes digital data in a second, low density (i.e., ANSI) format. A first read decoder (428) decodes digital data from the first format. A second read decoder (426) decodes digital data from the second format. A disk drive (432) receives a replaceable 90 millimeter optical disk. A read/write head (420) reads encoded data from and writes encoded data to a 90 millimeter optical disk received by the drive. In a first mode, the first write encoder is connected between a source of digital data and the read/write head, and the first read decoder is connected between the read/write head (420) and the utilizing apparatus (410). In a second mode, the second encoder is connected between the source and the read/write head, and the second read decoder is connected between the read/write head and the utilizing apparatus.