Sudden Motion Sensor

<h2 id="aftermarket-hardware-problems">Aftermarket hardware problems</h2>

<p>Among the MacBook and MacBook Pro community there have been several owners who installed aftermarket hard drives already equipped with anti-shock features who reported experiencing <a href="/facts/Kernel_panic/aSp4ojw2">kernel panic</a> errors whenever their unit was physically moved. This is believed[<i>by whom?</i>] to be due to a conflict between SMS and the new drive's anti-shock function. The <a href="/facts/Western_Digital/Yqc4qS3l">Western Digital</a> Scorpio series of notebook hard drives have been the most frequently reported[<i>where?</i>] as being susceptible to this problem. In practically all cases, disabling SMS alleviated this problem without any negative performance impact.[<i>according to whom?</i>]
</p>
<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Active_hard-drive_protection/z91mwIeX">Active hard-drive protection</a></li></ul>
<h2 id="external-links">External links</h2>
<ul><li><a href="http://support.apple.com/kb/HT1935">Apple.com: Sudden Motion Sensor disable instructions</a></li>
<li><a href="http://www.suitable.com/tools/seismac.html">SeisMac: Displays seismic data obtained from your SMS</a></li>
<li><a href="http://osxbook.com/software/sms/amstracker/">AMSTracker by Amit Singh</a>, <a href="/facts/Command_line_utility/Gkr3u58Y">Command line utility</a> for reading data from the Sudden Motion Sensor</li></ul>

Sudden Motion Sensor open-in-new

Sudden Motion Sensor