公开(公告)号：US5029022A

公开(公告)日：1991-07-02

申请号：US294077

申请日：1989-01-05

申请人： Kentaro Odaka ,  Yoshizumi Inazawa ,  Brian A. Milthorp ,  Bruce A. Thompson

发明人： Kentaro Odaka ,  Yoshizumi Inazawa ,  Brian A. Milthorp ,  Bruce A. Thompson

IPC分类号： G11B20/12 ,  G11B27/032 ,  G11B27/30 ,  G11B27/32

CPC分类号： G11B20/1209 ,  G11B27/032 ,  G11B27/3027 ,  G11B27/3063 ,  G11B27/309 ,  G11B27/328 ,  G11B20/1211 ,  G11B2220/216 ,  G11B2220/90 ,  G11B2220/913

摘要： A method is disclosed for effecting update-in-place of data that has been recorded on tape in oblique tracks using a helical-scan recording technique. The data to be updated is recorded in a block of M tracks lying between first and second continuum each at least of N tracks where N is the worst-case number of tracks required to achieve head/track alignment. The block of M tracks comprises a first series of at least N tracks, a second series of tracks containing the data, and a third series of at least P tracks. When updating the data, the block is rewritten as a whole in a single continuum with the first track of the block being written within a distance of P tracks from the last track of the first continuum.

公开(公告)号：US5081548A

公开(公告)日：1992-01-14

申请号：US485239

申请日：1990-02-26

申请人： Yoshizumi Inazawa ,  Brian A. Milthorp

发明人： Yoshizumi Inazawa ,  Brian A. Milthorp

IPC分类号： G06F3/06 ,  G06F12/00 ,  G11B5/008 ,  G11B20/10 ,  G11B20/12 ,  G11B27/30 ,  G11B27/32 ,  G11B27/36

CPC分类号： G11B27/328 ,  G11B20/10 ,  G11B20/1209 ,  G11B27/3063 ,  G11B27/36 ,  G11B5/00813 ,  G11B20/1211 ,  G11B2220/90 ,  G11B2220/913

摘要： Data storage apparatus is known in which data is stored on a tape medium in at least two different longitudinally spaced sections (Partitions I and 0) with data recordal in each section being effected in accordance with a predetermined format. This format will generally be of the type in which tape-usage information is recorded in a system log (82) located upstream of the main data area (37). It is also known to record tape usage information relating to each tape section (Partition 1,0) in the system log (82) of that section. The present apparatus provides not only for the recording of usage information from which section-specific information can be derived, but also for the recording of aggregated tape usage information. This latter information is stored in the system log (82) of the first tape section (Partition 1) so as to be readily accessible upon tape loading.

公开(公告)号：US5057950A

公开(公告)日：1991-10-15

申请号：US295174

申请日：1989-01-06

申请人： Shinya Ozaki ,  Masaki Yamada ,  Brian A. Milthorp ,  Bruce A. Thompson

发明人： Shinya Ozaki ,  Masaki Yamada ,  Brian A. Milthorp ,  Bruce A. Thompson

IPC分类号： G11B20/12 ,  G06F3/06 ,  G11B15/02 ,  G11B27/00 ,  G11B27/10 ,  G11B27/30 ,  G11B27/32

CPC分类号： G06F3/0601 ,  G11B15/026 ,  G11B27/107 ,  G11B27/3027 ,  G11B27/3063 ,  G11B27/309 ,  G11B27/328 ,  G06F2003/0698 ,  G11B2220/90 ,  G11B2220/913

摘要： Before reading/writing a newly loaded data tape, it is known to carry out read/write tests on the tape drive concerned by using a section of the tape set aside for this purpose. This test section is generally marked off by formatting keys which must be accessed and read to identify the test section. In order to facilitate access to the test section, the disclosed data storage method locates the test section in the region of tape between a beginning-of-media BOM position and a beginning-of-recording BOR position with the latter being at a known distance from BOM. As a result, it is possible to rely simply on displacement measurement to access the test section from BOM. As a precaution, a check can be made for possible overshoot error in the tape positioning means so as to avoid testing being carried out beyond BOR.