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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><!-- http://linux-ntfs.sourceforge.net/ntfs/files/bitmap.html --><html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <meta name="description" content="NTFS Documentation"> <link rel="stylesheet" type="text/css" href="../style/ntfsdoc.css"> <link rel="start" type="text/html" href="../index.html" title="NTFS Documentation"> <title>$Bitmap (6) - File - NTFS Documentation</title> </head> <body> <table border="0" class="toolbar" summary="" cellspacing="0"> <tr> <td class="toolbar"><a accesskey="1" class="toolbar" href="../index.html">Home</a></td> <td class="toolbar"> </td> <td class="toolbar"><a accesskey="2" class="toolbar" href="../files/index.html">Files</a></td> <td class="toolbar"> </td> <td class="toolbar"><a accesskey="3" class="toolbar" href="../attributes/index.html">Attributes</a></td> <td class="toolbar"> </td> <td class="toolbar"><a accesskey="4" class="toolbar" href="../concepts/index.html">Concepts</a></td> <td class="toolbar"> </td> <td class="toolbar"><a accesskey="5" class="toolbar" href="../help/glossary.html">Glossary</a></td> <td class="toolbar"> </td> <td class="toolbar"><a accesskey="6" class="toolbar" href="../help/index.html">Help</a></td> </tr> </table> <h1>File - $Bitmap (6)</h1> <a class="prevnext" accesskey="," href="dot.html">Previous</a> <a class="prevnext" accesskey="." href="boot.html">Next</a> <h2>Overview</h2> <p> This file lists which clusters are in use. Each bit in this file represents one LCN. </p> <h2><a class="heading" href="../attributes/index.html">Attributes</a></h2> <table border="1" summary="" cellspacing="0"> <tr> <th class="numeric">Type</th> <th>Description</th> <th>Name</th> </tr> <tr> <td class="numeric"><a class="numeric" href="../attributes/standard_information.html">0x10</a></td> <td><a href="../attributes/standard_information.html">$STANDARD_INFORMATION</a></td> <td> </td> </tr> <tr> <td class="numeric"><a class="numeric" href="../attributes/file_name.html">0x30</a></td> <td><a href="../attributes/file_name.html">$FILE_NAME</a></td> <td>$Bitmap</td> </tr> <tr> <td class="numeric"><a class="numeric" href="../attributes/data.html">0x80</a></td> <td><a href="../attributes/data.html">$DATA</a></td> <td>[Unnamed]</td> </tr> </table> <h2>Layout of the File</h2> <h3>Unnamed Data Stream</h3> <p>The lowest bit represents the lowest numbered LCN. Thus:</p> <table border="1" summary="" cellspacing="0"> <tr> <th class="numeric">Bit</th> <th class="numeric">LCN</th> </tr> <tr> <td class="numeric">00000001<sub>2</sub></td> <td class="numeric">0</td> </tr> <tr> <td class="numeric">00000010<sub>2</sub></td> <td class="numeric">1</td> </tr> <tr> <td class="numeric">00000100<sub>2</sub></td> <td class="numeric">2</td> </tr> <tr> <td class="numeric">...</td> <td class="numeric">etc</td> </tr> </table> <h2>Notes</h2> <h3>MFT Zone</h3> <p> To prevent the MFT becoming fragmented, Windows maintains a buffer around it. No new files will be created in this buffer region until the other disk space is used up. The buffer size is configurable and can be 12.5%, 25%, 37.5% or 50% of the disk. Each time the rest of the disk becomes full, the buffer size is halved. </p> <h3>Other Information</h3> <p> The size of this file is always a multiple of 8 bytes (64 clusters). Because of this rounding-up, the $Bitmap will represent slightly more clusters than the disk has. These bit are always set to 1. </p> <p> The backup copy of the boot sector lies in this no-mans-land the cluster is hence marked as in use. </p> <p> In theory, on very small volume, this attribute could be resident. In practice, Windows crashes. </p> <br> <a class="contact" href="http://linux-ntfs.sourceforge.net/ntfs/files/bitmap.html">Online</a> <!-- The two validators will only work if this page is visible on the web --> <a class="contact" href="http://validator.w3.org/check/referer">Validate HTML</a> <a class="contact" href="http://jigsaw.w3.org/css-validator/check/referer">Validate CSS</a> <a class="contact" href="mailto:webmaster@flatcap.org">$Id: bitmap.html,v 1.11 2001/07/11 16:31:44 flatcap Exp $</a> </body></html>⌨️ 快捷键说明
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