231 lines
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231 lines
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<title>IBM standard
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data set label 1 (HDR1/EOV1/EOF1)</title>
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<body id="hdr1d"><a name="hdr1d"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">IBM standard
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data set label 1 (HDR1/EOV1/EOF1)</h1>
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<div><p>Learn the details of IBM<sup>®</sup> standard data set label 1 (HDR1/EOV1/TRL1)
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by reading this information. The IBM standard data set label 1 (HDR1/EOV1/TRL1)
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is 80 characters in length, and you use it to identify each data set.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="0" rules="none"><caption>Table 1. Format of the IBM Standard Data
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Set Label 1 (HDR1/EOV1/EOF1)</caption><thead align="left"><tr><th align="left" valign="top" width="12.415349887133182%" id="d0e33">Offset</th>
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<th align="left" valign="top" width="17.607223476297968%" id="d0e35">Data Type</th>
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<th align="left" valign="top" width="13.99548532731377%" id="d0e37">Length</th>
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<th align="left" valign="top" width="55.98194130925508%" id="d0e39">Contents</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">0</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">3</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Label identifier</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">3</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">1</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Label number</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">4</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">17</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Data Set (File) Identifier</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">21</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">6</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Aggregate volume identifier</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">27</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">4</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Aggregate volume sequence number</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">31</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">4</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Data Set (File) sequence number</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">35</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">4</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Generation Number (not used)</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">39</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">2</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Generation Version Number (not used)</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">41</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">6</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Creation Date</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">47</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">6</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Expiration Date</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">53</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">1</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Data Set (File) Security (not used)</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">54</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">6</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Block Count, Low Order (Trailer labels only)</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">60</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">13</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">System Code (Trailer labels only)</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">73</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">3</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Reserved</td>
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</tr>
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<tr><td align="left" valign="top" width="12.415349887133182%" headers="d0e33 ">76</td>
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<td align="left" valign="top" width="17.607223476297968%" headers="d0e35 ">Character</td>
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<td align="left" valign="top" width="13.99548532731377%" headers="d0e37 ">4</td>
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<td align="left" valign="top" width="55.98194130925508%" headers="d0e39 ">Block Count, High Order (Trailer labels only)</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p></p>
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<p>The program records the data set label in EBCDIC.</p>
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<p>The program describes the contents and function of each of the following
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fields.</p>
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<ul><li>Label identifier <p>The characters identify the type of data set label.
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</p>
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<ul><li>HDR - Header Label (the beginning of a data set)</li>
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<li>EOF - Trailer Label (the end of a data set)</li>
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<li>EOV - Trailer Label (the end of a data set that is continued on another
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volume)</li>
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</ul>
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</li>
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<li>Label number <p>The relative position of this label, within a set of
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labels of the same type; it is always 1 for the IBM data set label 1.</p>
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</li>
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<li>Data Set Identifier (file name) <p>A unique identification code to identify
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the data set (file). If the data set ID is less than 17 characters, it is
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left-aligned, and you pad it with blanks.</p>
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</li>
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<li>Aggregate volume identifier <p>This field contains the volume identifier
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from the volume labels of the first volume in a multivolume data set.</p>
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</li>
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<li>Aggregate volume sequence number <p>This field contains the relative
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volume number of this volume in a multivolume data set. The field is 0001
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for a single volume data set.</p>
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</li>
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<li>Data Set (File) sequence number <p>This field indicates the relative
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position of the data set within a multiple data set group. The value will
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be in EBCDIC displayable characters for 0001–9999. For numbers larger than
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9999 that will not fit in the 4–character field as an EBCDIC displayable character
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set, the first byte will a '?' ('6F'x) for EBCDIC labels. The last three bytes
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will be a binary number from 1 to 64000.</p>
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</li>
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<li>Generation Number that is not used. <p>If the data set is a part of a
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generation data group, this field contains a number that indicates absolute
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generation number. <span class="keyword">i5/OS™</span> does
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not use this field.</p>
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</li>
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<li>Generation Version Number (not used) <p>If the data set is part of a
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generation data group, this field contains a number that indicates the version
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number of the generation. <span class="keyword">i5/OS</span> does
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not use this field.</p>
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</li>
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<li>Creation Date <p>The creation date of the data set. The program shows
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the date in the format cyyddd, where:</p>
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<p> c = century (blank=19; 0=20;
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1=21; and so on)</p>
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<p> yy = year (00-99)</p>
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<p>ddd = day of the current
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year (001-366)</p>
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<p>Note that the century code gives the first two digits
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of the year, not the actual century. For example, a blank which translates
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into 19 indicates a year in the 1900s, not in the nineteenth century.</p>
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</li>
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<li>Expiration Date <p>The date the program considers the data set expired.
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Expiration date refers to a data set that is allowed to be overwritten. The
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user specifies the date in the open tape file that is used in writing the
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tape. You ignore the expiration date on input, and verify the expiration date
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on output by <span class="keyword">i5/OS</span>.
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The date is in the format cyyddd, where:</p>
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<p> c = century (blank=19; 0=20;
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1=21; and so on)</p>
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<p> yy = year (00-99)</p>
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<p>ddd = day of the current
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year (001-366)</p>
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<p>Note that the century code gives the first two digits
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of the year, not the actual century. For example, a blank which translates
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into 19 indicates a year in the 1900s, not in the nineteenth century.</p>
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</li>
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<li>Data Set (File) Security that is not used. <div class="p">A code number indicates
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the security status of the data set. <span class="keyword">i5/OS</span> does not use this field. The following
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values indicate data set security values that are created by other systems:
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<dl><dt class="dlterm">0</dt>
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<dd>No password protection</dd>
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<dt class="dlterm">1</dt>
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<dd>Password protection (required for read/write/deletion)</dd>
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<dt class="dlterm">3</dt>
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<dd>Password protection that is required for write/deletion.</dd>
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</dl>
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</div>
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</li>
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<li>Block Count, Low Order (Trailer labels only) <p>The field in the trailer
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labels contains the low order six digits of the number of data blocks in the
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data set on the current volume. The field in the header labels contains hex
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zeros.</p>
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</li>
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<li>System Code (Trailer labels only) <div class="p">A unique code that identifies the
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system that created the data set. <dl><dt class="dlterm">IBMOS400</dt>
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<dd>IBM <span class="keyword">i5/OS</span> (previously OS/400<sup>®</sup>)</dd>
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<dt class="dlterm">IBM OS/VS
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370</dt>
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<dd>IBM MVS™ operating
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system</dd>
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</dl>
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</div>
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</li>
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<li>Block Count, High Order (Trailer labels only) <p>The field in the trailer
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labels contains the high order four digits of the number of data blocks in
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the data set on the current volume. The field in the header labels contains
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hex zeros.</p>
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</li>
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</ul>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="volum.htm" title="This topic describes the volume labels used in the open feedback area.">Volume label fields</a></div>
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</div>
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</div>
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</body>
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</html> |