公开(公告)号：CA2081179C

公开(公告)日：1996-12-17

申请号：CA2081179

申请日：1992-10-22

Applicant: IBM

Inventor： JAQUETTE GLEN A ,  KULAKOWSKI JOHN E ,  MCDOWELL JUDSON A ,  MEANS RODNEY J

IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/24 ,  G11B7/26 ,  G11B7/28 ,  G11B20/12 ,  G11B27/10

Abstract: Data-storing disks, preferably each disk having a single spiral track, have addressable tracks that are independent of the length of disk or spiral track revolutions. Each revolution may contain a non-integral number of addressable tracks and sectors. An optical disk is used to describe the invention. The circumferential location of the tracks and sectors precess circumferentially. A plurality of radially disposed revolution bands each contain a fixed number of the revolutions an increasing number of the addressable tracks in the radially outer more ones of the bands. It is preferred that the number of bands be 2n, where n is an integer. Each band is divided into a plurality of revolution groups, each group having a fixed number of revolutions. Each group in a band has a like number of the addressable tracks. A so-called anchor sector has one end anchored to a reference circumferential position on the disk. Each revolution group begins with an anchor sector, all other sectors in the group are positioned circumferentially with respect to the anchor sector. Addressable track seeking, alternate embodiments and fabrication of a disk are described.

公开(公告)号：CA1314100C

公开(公告)日：1993-03-02

申请号：CA584969

申请日：1988-12-05

Applicant: IBM

Inventor： KULAKOWSKI JOHN E ,  MEANS RODNEY J

IPC: G06F3/06 ,  G06F12/00 ,  G11B7/24 ,  G11B13/04 ,  G11B20/12 ,  G11B20/18

Abstract: A large capacity data storing disk includes a volume table of contents (VTOC) which identifies allocated ones of data storage tracks and identification of the data contents therein, indications of unallocated data storage track and an indication of which of the data storage tracks on the large capacity disk surface are unformatted. The indications may also include indications of unallocated "erased" tracks that do not contain data residuals from previous recordings. Those unallocated tracks having such erased condition in a count key data record format (CKD) require a home address record on each of the formatted tracks. The home address record may include indications of rotational position of defects to be skipped over during the recording and readback operations. A specific embodiment of the invention using a magnetooptic record medium is described.

公开(公告)号：BR9103889A

公开(公告)日：1992-05-26

申请号：BR9103889

申请日：1991-09-10

Applicant: IBM

Inventor： KULAKOWSKI JOHN E ,  MEANS RODNEY J ,  TAYEFEH MOROVAT

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/007 ,  G11B7/013 ,  G11B11/10 ,  G11B11/105 ,  G11B20/12 ,  G11B11/12 ,  G11B23/30

Abstract: The present invention relates to a re-writable data storage member (10) comprising a plurality of spaced apart addressable data storage areas (12) for recording and storing data and a plurality of non-data storage areas (15) interposed between adjacent ones of the addressable data storage areas for recording signals not representing data, the storage member being adapted to be scanned in a direction over the storage areas. According to the invention the storage member is characterised in that one of the addressable data storage areas contains first machine readable indicia indicating that the storage member contains data which is not to be changed from any original recording of the data, another of the addressable data storage areas contains second machine readable indicia indicating whether or not the storage member has been erased of data in its entirety, and each of the non-data storage areas contains third machine readable indicia indicating whether or not one of the respective adjacent addressable data storage areas can be written into. The invention also relates to a data storage system comprising a re-writable data storage member as above and to a method of operating such a data storage system.

公开(公告)号：CA1281424C

公开(公告)日：1991-03-12

申请号：CA557767

申请日：1988-01-29

Applicant: IBM

Inventor： FLANNAGAN WILLIAM J ,  KERN RONALD M ,  KULAKOWSKI JOHN E ,  WAGNER ROBERT E

IPC: G06F12/00 ,  G06F3/06 ,  G06F17/30 ,  G11B7/007 ,  G11B20/12 ,  G11B20/18 ,  G11B27/28 ,  G11B27/32 ,  G11B7/013

Abstract: An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorded. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable. TU985007