<div dir="ltr"><div><div><div>Almost. The row refresh rate is set to be faster than the decay rate. The decay rate is far longer (closer to an order of magnitude for total loss) but the rate is set to ensure no loss at all.<br>
<br></div>It is possible to move RAM from one running system to a special system by using liquid nitrogen to freeze the RAM, quickly move RAM to special system that can start RAM refresh on a new populated slot without a reboot. Timeframe for this changes from nanoseconds to seconds. With liquid helium it changes to minutes.<br>
<br></div>It's this time frame that is the security risk. It underlines the need for physical security of systems.<br><br></div>I have a vague recollection of high security RAM that could detect being unplugged and it would discharge a capacitor across the banks to zap them. <br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jan 31, 2014 at 8:41 AM, Matt Hessel <span dir="ltr"><<a href="mailto:matt.hessel@gmail.com" target="_blank">matt.hessel@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Technically RAM only maintains the contents as long as the row refresh rate, which for DDR3 is measured in nano seconds. </p>
<div class="gmail_quote"><div><div class="h5">On Jan 29, 2014 1:15 PM, "Greg Clifton" <<a href="mailto:gccfof5@gmail.com" target="_blank">gccfof5@gmail.com</a>> wrote:<br type="attribution"></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div class="h5">
<div dir="ltr">Maybe this is Off Topic, but it is computer related. So here is the deal, I have a RFQ to quote on some computers to go into a classified application and the customer wants a Letter of Volatility. Now, obviously, the mass storage will be removable, but they are concerned about any memory in the system. I take this to include both volatile SDRAM (DDR3) and any non-volatile memory such as the CMOS for the BIOS (is it possible that some bot could be lurking there that could grab data and send it out when the computer is turned on?).<br>
<div><br></div><div>My question is basically, how long does DDR3 maintain any recoverable data once the power is turned off. I would assume that power should be totally removed (as in unplugged from the wall) so that there is not even 5V standby power, no?</div>
<div><br></div><div>Comments and especially links to solid information would be appreciated.</div><div><br></div><div>Thanks in advance,</div><div>Greg Clifton</div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div dir="ltr">-- <br>James P. Kinney III<br><i><i><i><i><br></i></i></i></i>Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
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