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Bob Mottram
2014-03-27 18:54:56 +00:00
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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<html xmlns="http://www.w3.org/1999/xhtml"><head><title>hole</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../H.html" title="H"/><link rel="previous" href="hog.html" title="hog"/><link rel="next" href="hollised.html" title="hollised"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">hole</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hog.html">Prev</a> </td><th width="60%" align="center">H</th><td width="20%" align="right"> <a accesskey="n" href="hollised.html">Next</a></td></tr></table><hr/></div><dt><a id="hole"/><dt xmlns="" id="hole"><b>hole</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> A region in an otherwise <a href="../F/flat.html"><i class="glossterm">flat</i></a> entity which is
not actually present. For example, some Unix filesystems can store large
files with holes so that unused regions of the file are never actually
stored on disk. (In techspeak, these are referred to as
&#8216;sparse&#8217; files.) As another example, the region of memory in
IBM PCs reserved for memory-mapped I/O devices which may not actually be
present is called &#8216;the I/O hole&#8217;, since memory-management
systems must skip over this area when filling user requests for
memory.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="hog.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../H.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="hollised.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">hog </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> hollised</td></tr></table></div></body></html>