EP0386362A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Data storage apparatus
Assignee: Hewlett Packard Ltd
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Filing: 1989-10-13
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Granted: —
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Expires: 2009-10-13
Abstract
Abstract Data storage apparatus is known in which data is stored on a tape medium in at least two different longitudinally-spaced sections (Partitions 1 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.
Inventors
- 👤 Yoshizumi Inazawa
- 👤 Brian Andrew Milthorp
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/328; G11B20/1201; G11B20/1207; G11B20/1209; G11B27/30; G11B27/3027; G11B27/3063; G11B27/36; G11B5/00; G11B5/008; G11B5/00813; G11B20/1211; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
Data storage apparatus for storing data on a tape medium, said apparatus comprising: -recording means for recording said data on a tape medium in accordance with a predetermined format, said format specifying a plurality of recording areas arranged one after another along the tape medium and including both a log area for storing tape-usage information and a data area for storing said data, - control means operative to cause the recording means to record data in at least two different longitudinally-spaced sections of the tape medium with data recordal in each section being respectively effected in accordance with said format, the said recording means including a tape-usage monitor operative to accumulate tape-usage information relating to data recordal on the tape medium, the form of said accumulated-tape usage information being such as to enable tape-usage information relating to each said tape section to be derived therefrom, the recording means being operative to record the accumulated tape-usage information in the said log areas associated with the said tape sections; characterized in that : the tape-usage monitor (68) is such that the accumulated tape-usage information includes aggregated data formed by aggregating tape-usage information across all said tape sections, the recording means (11, 41 to 44) being operative to record the aggregated data in the said log area (82) of the first said tape section (Partition 1) encountered from the beginning of the tape (10).
Claim 2
Dependent Claim
231 words
Data storage apparatus for storing data on a tape medium, said apparatus comprising: -recording means for recording said data on a tape medium in accordance with a predetermined format, said format specifying a plurality of recording areas arranged one after another along the tape medium and including both a log area for storing tape-usage information and a data area for storing said data, - control means operative to cause the recording means to record data in at least two different longitudinally-spaced sections of the tape medium with data recordal in each section being respectively effected in accordance with said format, the said recording means including a tape-usage monitor operative to accumulate tape-usage information relating to data recordal on the tape medium, the form of said accumulated-tape usage information being such as to enable tape-usage information relating to each said tape section to be derived therefrom, the recording means being operative to record the accumulated tape-usage information in the said log areas associated with the said tape sections; characterized in that : the tape-usage monitor (68) is such that the accumulated tape-usage information includes aggregated data formed by aggregating tape-usage information across all said tape sections, the recording means (11, 41 to 44) being operative to record the aggregated data in the said log area (82) of the first said tape section (Partition 1) encountered from the beginning of the tape (10).
Claim 3
Dependent Claim
66 words
Data storage apparatus according to claim 1, wherein said accumulated tape-usage information comprises, in addition to said aggregated data, respective section-usage data relating specifically to the or each tape section downstream of said first section, the recording means (11,41 to 44) being operative to record the section-usage data relating to a specific tape section (Partition 0) in the said log area (82) of that tape section.
Claim 4
Dependent Claim
100 words
Data storage apparatus according to claim 1, wherein said accumulated tape-usage information comprises, in addition to said aggregated data, respective sub-total data associated with the or each tape section (Partition 0) downstream of said first section (Partition 1), this data being formed for a particular said section by aggregating the tape usage information relating to that section with tape usage information of the or each downstream tape section, the recording means (11, 41 to 44) being operative to record the sub-total data associated with a particular tape section (Partition 0) in the said log area (82) of that tape section.
Claim 5
Dependent Claim
108 words
Data storage apparatus according to claim 2 or claim 3, further comprising readback means for reading back data and tape-usage information recorded on said medium in accordance with said predetermined format, said control means being operative to control the readback means to read back data and tape usage information from each said section of the tape as required, characterized in that the apparatus is provided with a tape-usage interpreter (90) operative to receive tape-usage information read back from the tape medium (10) by the readback means (11, 41, 42), and to derive therefrom tape-usage information relating specifically to each said tape section, including said first section (Partition 1).
Claim 6
Dependent Claim
53 words
Data storage apparatus according to claim 4 when dependent on claim 2, wherein the tape-usage interpreter (90) is operative to derive tape-usage information relating specifically to said first section (Partition 1) by subtracting from said aggregated data the section usage data readback from the or each section (Partition 0) downstream of the first.
Claim 7
Dependent Claim
53 words
Data storage apparatus according to claim 4 when dependent on claim 3, wherein the tape-usage interpreter (90) is operative to derive tape-usage information relating to a specific said tape section by subtracting from the tape-usage data readback from that section, the tape-usage data read back from the immediately following tape section, if any.
References Cited (Backward Citations)
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