公开(公告)号：CA2045948A1

公开(公告)日：1992-02-21

申请号：CA2045948

申请日：1991-06-28

Applicant: IBM

Inventor： FRIEDL THEODORE J ,  GREGG LEON E ,  LOEN LARRY W ,  ROLFE RANDY K

IPC: G06F12/00 ,  G06F11/08 ,  G11B20/18 ,  G11C29/00 ,  G11B20/12

Abstract: A data storage medium having the ability to recover from media errors includes a directory located at any desired region of a data storage area with redundant directory pointers at reserved locations. A unique file token is included in the directory entry for each data file and is also included in each extent list where the locations of parts of a fragmented data file are stored. Multiple extent lists are chained in two directions to facilitate reconstruction of the chain if part of the pointer information is lost.

公开(公告)号：CA2045947C

公开(公告)日：1995-02-14

申请号：CA2045947

申请日：1991-06-28

Applicant: IBM

Inventor： GREGG LEON E ,  ROLFE RANDY K

IPC: G06F3/06 ,  G06F3/08 ,  G06F12/00 ,  G06F17/30 ,  G11B20/12

Abstract: A write once ready many (WORM) data storage medium includes primary and secondary data storage areas in which data and pointers to allocated but unwritten update areas are written. Original and updated data is written in a write sequence or chain of primary data areas separated by branched secondary data storage areas. The most recent updated data is found in a two level search of primary and then secondary data storage areas in order to save time by searching only those secondary areas where the most recent update exist.

公开(公告)号：BR9103523A

公开(公告)日：1992-05-12

申请号：BR9103523

申请日：1991-08-16

Applicant: IBM

Inventor： FRIEDL THEODORE J ,  GREGG LEON E ,  LOEN LARRY W ,  ROLFE RANDY K

IPC: G06F12/00 ,  G06F11/08 ,  G11B20/18 ,  G11C29/00 ,  G11B20/10 ,  G11B11/00

Abstract: A data storage medium having the ability to recover from media errors includes a directory (36) located at any desired region of a data storage area with redundant directory pointers at reserved locations. A unique file token is included in the directory entry (40) for each data file and is also included in each extent list (44) where the locations of parts of a fragmented data file are stored. Multiple extent lists are chained in two directions to facilitate reconstruction of the chain if part of the pointer information is lost.

公开(公告)号：BR9103522A

公开(公告)日：1992-05-12

申请号：BR9103522

申请日：1991-08-16

Applicant: IBM

Inventor： GREGG LEON E ,  ROLFE RANDY K

IPC: G06F3/06 ,  G06F3/08 ,  G06F12/00 ,  G06F17/30 ,  G11B20/12 ,  G11B7/00 ,  G11B20/10

Abstract: A WORM data storage medium includes primary (100, 200, 300, ...) and secondary (101-104) data storage areas in which data and pointers to allocated but unwritten update areas are written. Original and updated data is written in a write sequence or chain of primary data areas separated by branched secondary data storage areas. The most recent updated data is found in a two level search of primary and then secondary data storage areas in order to save time by searching only those secondary areas where the most recent update exist.