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<h1 id="mh-usb-internals">MH-USB Internals<a class="headerlink" href="#mh-usb-internals" title="Permanent link">¶</a></h1>
<h2 id="mh-usb-performance">MH-USB Performance<a class="headerlink" href="#mh-usb-performance" title="Permanent link">¶</a></h2>
<h3 id="usb2-version">USB2 Version<a class="headerlink" href="#usb2-version" title="Permanent link">¶</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 60
Mbytes/s. However due to various constraints the maximum throughput is
restricted 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">¶</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">¶</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">¶</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">"sync && echo 3 > /proc/sys/vm/drop_caches"</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">¶</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">¶</a></h2>
<h3 id="the-ventoy-partion-layout">The Ventoy partion layout<a class="headerlink" href="#the-ventoy-partion-layout" title="Permanent link">¶</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">¶</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">¶</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">¶</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">¶</a></h3>
<h3 id="the-scripts">The scripts<a class="headerlink" href="#the-scripts" title="Permanent link">¶</a></h3>
<h4 id="download-imagessh"><code>download-images.sh</code><a class="headerlink" href="#download-imagessh" title="Permanent link">¶</a></h4>
<h4 id="prepare-usbsh"><code>prepare-usb.sh</code><a class="headerlink" href="#prepare-usbsh" title="Permanent link">¶</a></h4>
<h4 id="qemu-sh"><code>qemu-*.sh</code><a class="headerlink" href="#qemu-sh" title="Permanent link">¶</a></h4>
<h3 id="installing-mh-usb">Installing MH-USB<a class="headerlink" href="#installing-mh-usb" title="Permanent link">¶</a></h3>
<h3 id="customising-the-mh-usb">Customising the MH-USB<a class="headerlink" href="#customising-the-mh-usb" title="Permanent link">¶</a></h3>
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