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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">                  <label class="md-nav__title" for="__toc">      <span class="md-nav__icon md-icon"></span>      Table of contents    </label>    <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>              <li class="md-nav__item">  <a href="#mh-usb-performance" class="md-nav__link">    MH-USB Performance  </a>      <nav class="md-nav" aria-label="MH-USB Performance">      <ul class="md-nav__list">                  <li class="md-nav__item">  <a href="#usb2-version" class="md-nav__link">    USB2 Version  </a>  </li>                  <li class="md-nav__item">  <a href="#usb3-version" class="md-nav__link">    USB3 Version  </a>  </li>              </ul>    </nav>  </li>              <li class="md-nav__item">  <a href="#the-mh-usb-partition-layout" class="md-nav__link">    The MH-USB partition layout  </a>      <nav class="md-nav" aria-label="The MH-USB partition layout">      <ul class="md-nav__list">                  <li class="md-nav__item">  <a href="#the-ventoy-partion-layout" class="md-nav__link">    The Ventoy partion layout  </a>  </li>                  <li class="md-nav__item">  <a href="#the-16-gb-model" class="md-nav__link">    The 16 GB model  </a>  </li>                  <li class="md-nav__item">  <a href="#the-32-gb-model" class="md-nav__link">    The 32 GB model  </a>  </li>              </ul>    </nav>  </li>              <li class="md-nav__item">  <a href="#using-the-mh-usb-source-code" class="md-nav__link">    Using the MH-USB Source Code  </a>      <nav class="md-nav" aria-label="Using the MH-USB Source Code">      <ul class="md-nav__list">                  <li class="md-nav__item">  <a href="#overview-of-the-source-code" class="md-nav__link">    Overview of the source code  </a>  </li>                  <li class="md-nav__item">  <a href="#the-scripts" class="md-nav__link">    The scripts  </a>  </li>                  <li class="md-nav__item">  <a href="#installing-mh-usb" class="md-nav__link">    Installing MH-USB  </a>  </li>                  <li class="md-nav__item">  <a href="#customising-the-mh-usb" class="md-nav__link">    Customising the MH-USB  </a>  </li>              </ul>    </nav>  </li>          </ul>  </nav>                  </div>                </div>              </div>                                <div class="md-content" data-md-component="content">            <article class="md-content__inner md-typeset">                              
<h1 id="mh-usb-internals">MH-USB Internals<a class="headerlink" href="#mh-usb-internals" title="Permanent link">&para;</a></h1><h2 id="mh-usb-performance">MH-USB Performance<a class="headerlink" href="#mh-usb-performance" title="Permanent link">&para;</a></h2><h3 id="usb2-version">USB2 Version<a class="headerlink" href="#usb2-version" title="Permanent link">&para;</a></h3><p>From <a href="https://www.blackmoreops.com/2017/04/04/usb-and-ssd-drive-speedtest-in-linux/">https://www.blackmoreops.com/2017/04/04/usb-and-ssd-drive-speedtest-in-linux/</a></p><blockquote><p>USB 2.0 has a theoretical maximum signaling rate of 480 Mbits/s or 60Mbytes/s. However due to various constraints the maximum throughput isrestricted to around 280 Mbit/s or 35 Mbytes/s.</p></blockquote><h4 id="hdparm-tests"><code>hdparm</code> tests<a class="headerlink" href="#hdparm-tests" title="Permanent link">&para;</a></h4><div class="highlight"><pre><span></span><code><span class="gp">$ </span>sudo hdparm -Ttv /dev/sde1<span class="go">/dev/sde1:</span><span class="go"> multcount     =  0 (off)</span><span class="go"> readonly      =  0 (off)</span><span class="go"> readahead     = 256 (on)</span><span class="go"> geometry      = 15600/64/32, sectors = 31881176, start = 2048</span><span class="go"> Timing cached reads:   16422 MB in  2.00 seconds = 8221.42 MB/sec</span><span class="go"> Timing buffered disk reads:  64 MB in  3.01 seconds =  21.28 MB/sec</span></code></pre></div><h4 id="dd-write-test"><code>dd</code> write test<a class="headerlink" href="#dd-write-test" title="Permanent link">&para;</a></h4><div class="highlight"><pre><span></span><code><span class="gp">$ </span>dd <span class="k">if</span><span class="o">=</span>/dev/zero <span class="nv">of</span><span class="o">=</span>perf <span class="nv">oflag</span><span class="o">=</span>direct <span class="nv">bs</span><span class="o">=</span>128k <span class="nv">count</span><span class="o">=</span>8k<span class="go">8192+0 records in</span><span class="go">8192+0 records out</span><span class="go">1073741824 bytes (1.1 GB, 1.0 GiB) copied, 6.94198 s, 155 MB/s</span></code></pre></div><h4 id="dd-read-test"><code>dd</code> read test<a class="headerlink" href="#dd-read-test" title="Permanent link">&para;</a></h4><div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># Clear the memory cache before benchmarking reads</span><span class="gp">$ </span>sudo sh -c <span class="s2">&quot;sync &amp;&amp; echo 3 &gt; /proc/sys/vm/drop_caches&quot;</span><span class="gp">$ </span>dd <span class="k">if</span><span class="o">=</span>perf <span class="nv">of</span><span class="o">=</span>/dev/null <span class="nv">bs</span><span class="o">=</span>4k<span class="go">262144+0 records in</span><span class="go">262144+0 records out</span><span class="go">1073741824 bytes (1.1 GB, 1.0 GiB) copied, 44.5847 s, 24.1 MB/s</span></code></pre></div><h3 id="usb3-version">USB3 Version<a class="headerlink" href="#usb3-version" title="Permanent link">&para;</a></h3><p><em>Coming soon!</em></p><h2 id="the-mh-usb-partition-layout">The MH-USB partition layout<a class="headerlink" href="#the-mh-usb-partition-layout" title="Permanent link">&para;</a></h2><h3 id="the-ventoy-partion-layout">The Ventoy partion layout<a class="headerlink" href="#the-ventoy-partion-layout" title="Permanent link">&para;</a></h3><p><em>Document how Ventoy creates partitions for both GPT and MBR partition tables</em></p><h3 id="the-16-gb-model">The 16 GB model<a class="headerlink" href="#the-16-gb-model" title="Permanent link">&para;</a></h3><p><em>Standard ventoy partitions</em></p><h3 id="the-32-gb-model">The 32 GB model<a class="headerlink" href="#the-32-gb-model" title="Permanent link">&para;</a></h3><p><em>Coming soon! (special partitions to accommodate haiku.)</em></p><h2 id="using-the-mh-usb-source-code">Using the MH-USB Source Code<a class="headerlink" href="#using-the-mh-usb-source-code" title="Permanent link">&para;</a></h2><h3 id="overview-of-the-source-code">Overview of the source code<a class="headerlink" href="#overview-of-the-source-code" title="Permanent link">&para;</a></h3><h3 id="the-scripts">The scripts<a class="headerlink" href="#the-scripts" title="Permanent link">&para;</a></h3><h4 id="download-imagessh"><code>download-images.sh</code><a class="headerlink" href="#download-imagessh" title="Permanent link">&para;</a></h4><h4 id="prepare-usbsh"><code>prepare-usb.sh</code><a class="headerlink" href="#prepare-usbsh" title="Permanent link">&para;</a></h4><h4 id="qemu-sh"><code>qemu-*.sh</code><a class="headerlink" href="#qemu-sh" title="Permanent link">&para;</a></h4><h3 id="installing-mh-usb">Installing MH-USB<a class="headerlink" href="#installing-mh-usb" title="Permanent link">&para;</a></h3><h3 id="customising-the-mh-usb">Customising the MH-USB<a class="headerlink" href="#customising-the-mh-usb" title="Permanent link">&para;</a></h3>
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