75 lines
5.6 KiB
HTML
75 lines
5.6 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Universal disk format" />
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<meta name="abstract" content="UDF (Universal Disk Format) is the OSTA (Optical Storage Technology Association) supported subset of ISO/IEC 13346." />
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<meta name="description" content="UDF (Universal Disk Format) is the OSTA (Optical Storage Technology Association) supported subset of ISO/IEC 13346." />
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<meta name="DC.Relation" scheme="URI" content="rzam4udfmediainterchg.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2004, 2006" />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<title>Universal disk format</title>
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</head>
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<body id="universaldiskformat"><a name="universaldiskformat"><!-- --></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">Universal disk format</h1>
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<div><p>UDF (Universal Disk Format) is the OSTA (Optical Storage Technology
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Association) supported subset of ISO/IEC 13346.</p>
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<div class="p"> UDF also addresses ECMA-167 which is equivalent to ISO 13346. UDF is a
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writable file format that provides true space reclaim capabilities as well
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as file and directory level security. This section contains detailed information
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on the i5/OS™ implementation
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of UDF for direct-attached (C4x) 3995 optical media libraries as well as a
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DVD-RAM device.<div class="note"><span class="notetitle">Note:</span> Although not accessible through i5/OS, CD and DVD media that are created
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using the supplementary volume descriptor of ISO 9660 may be accessible in
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an iSeries™ server.
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You can access them through an integrated server. For more information, see
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the <em>Windows<sup>®</sup> environment on iSeries</em> and <em>Linux<sup>®</sup> on an Integrated xSeries<sup>®</sup> Solution</em> topics.</div>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rzam4udfvoldirfile.htm">Volume, directory, and file names</a></strong><br />
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Volume identifiers can be a maximum of 30 characters and must contain only alphabetic characters (A through Z), numeric characters (0 through 9), a hyphen (-), or a period (.). The first character must be alphabetic or numeric, and the identifier cannot contain imbedded blanks.</li>
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<li class="ulchildlink"><strong><a href="rzam4udfproginterfces.htm">Programming interfaces UDF</a></strong><br />
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You can create files or read files on UDF media by using either
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the Hierarchical File System (HFS) application programming interface (API)
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or the integrated file system programming interface. There are things specific
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to the i5/OS implementation
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of the UDF media format that application developers need to know.</li>
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<li class="ulchildlink"><strong><a href="rzam4udfdirfiilesec.htm">Directory and file security</a></strong><br />
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Directory and file-level security is available for UDF volumes. The system maintains the data authorities of optical directories and files for three groups of users; owner, group, and public. Volume level security is also available through authorization lists.</li>
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<li class="ulchildlink"><strong><a href="rzam4udfmediainterchg.htm">Media interchange</a></strong><br />
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UDF media created on i5/OS is UDF Version 2.01. This media will
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interchange to other operating system platforms that support this version
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of UDF.</li>
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<li class="ulchildlink"><strong><a href="rzam4udfdirstructperf.htm">Directory structure and performance UDF</a></strong><br />
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UDF volumes have a single (hierarchical) directory structure to access files. Because of this hierarchical directory structure, the depth of a directory tree has a direct impact on file performance. For example, if /DIRECTORY1 contains 1000 files and /DIRECTORY2 contains 100 files, file search times for files in /DIRECTORY1, in general, take longer than file searches in /DIRECTORY2. This is because the system performs file searches hierarchically, which may require looking at every entry in the directory.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzam4optmedfrmat.htm" title="i5/OS provides support for several optical media types and media formats.">Optical media formats</a></div>
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</div>
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</div>
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</body>
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