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<body class="manpage">
<div id="header">
<h1>
nvme-wdc-cap-diag(1) Manual Page
</h1>
<h2>NAME</h2>
<div class="sectionbody">
<p>nvme-wdc-cap-diag -
   Retrieve WDC device's diagnostic log and save to file.
</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="verseblock">
<pre class="content"><em>nvme wdc cap-diag</em> &lt;device&gt; [--output-file=&lt;FILE&gt;, -o &lt;FILE&gt;] [--transfer-size=&lt;SIZE&gt;, -s &lt;SIZE&gt;]</pre>
<div class="attribution">
</div></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph"><p>For the NVMe device given, sends the WDC Vendor Unique Capture-Diagnostics
request and saves the result to a file.</p></div>
<div class="paragraph"><p>The &lt;device&gt; parameter is mandatory NVMe character device (ex: /dev/nvme0).</p></div>
<div class="paragraph"><p>This will only work on WDC devices supporting this feature.
Results for any other device are undefined.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_options">OPTIONS</h2>
<div class="sectionbody">
<div class="dlist"><dl>
<dt class="hdlist1">
-o &lt;FILE&gt;
</dt>
<dt class="hdlist1">
--output-file=&lt;FILE&gt;
</dt>
<dd>
<p>
        Output file; defaults to device serial number followed by "cap_diag" suffix
</p>
</dd>
<dt class="hdlist1">
-s &lt;SIZE&gt;
</dt>
<dt class="hdlist1">
--transfer-size=&lt;SIZE&gt;
</dt>
<dd>
<p>
        Transfer size; defaults to 0x10000 (65536 decimal) bytes
</p>
</dd>
</dl></div>
</div>
</div>
<div class="sect1">
<h2 id="_examples">EXAMPLES</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Gets the capture diagnostics log from the device and saves to default file in current directory (e.g. STM00019F3F9cap_diag.bin):
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme wdc cap-diag /dev/nvme0</code></pre>
</div></div>
</li>
<li>
<p>
Gets the capture diagnostics log from the device and saves to defined file in current directory (e.g. testSTM00019F3F9cap_diag.bin):
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme wdc cap-diag /dev/nvme0 -o test</code></pre>
</div></div>
</li>
<li>
<p>
Gets the capture diagnostics log from the device and saves to defined file with pathname (e.g. /tmp/testSTM00019F3F9cap_diag.bin):
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme wdc cap-diag /dev/nvme0 -o /tmp/test</code></pre>
</div></div>
</li>
<li>
<p>
Gets the capture diagnostics log from the device transferring the data in 64k chunks and saves to default file in current directory (e.g. STM00019F3F9internal_fw_log.bin):
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme wdc cap-diag /dev/nvme0 -s 0x10000</code></pre>
</div></div>
</li>
<li>
<p>
Gets the capture diagnostics log from the device transferring the data in 16k chunks and saves to default file in current directory (e.g. STM00019F3F9internal_fw_log.bin):
</p>
<div class="listingblock">
<div class="content">
<pre><code># nvme wdc cap-diag /dev/nvme0 -s 16384</code></pre>
</div></div>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_nvme">NVME</h2>
<div class="sectionbody">
<div class="paragraph"><p>Part of the nvme-user suite.</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated
 2025-11-19 00:00:00 UTC
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