![]() ![]() Once memory reaches this point, there is statistically no way to know whether its original value was a 0 or a 1 - it is unrecoverable. If you're using DDR3, the maximum time you'll need to wait for data coherence to reduce to the 50% mark at room temperature (~25C) after power-off is about 45 seconds, though in practice it can be as short as 1.5 seconds. The data gets less and less coherent over time, until it's just garbage. When you power down, the memory is no longer being refreshed, so that charge leaks out. Essentially, each "cell" of memory is a small capacitor which can be charged or not charged (representing 0 or 1). ![]() DDR memory technology has to be "refreshed" continuously by the memory controller in order to prevent the data from decaying into an unreliable state.
0 Comments
Leave a Reply. |