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I don't have a reader yet but could it be the music reader? It seems to be the only actual power drain on that particular device. Up to date many people complained of the music player staying on when not used, being unintuitively difficult to turn off. An iPod shuts itself off when the headphones are unplugged for more than a certain time, do Sony music players do the same? Why is there no similar feature on the reader?
An SD only takes power when accessed. Is there a feedback loop on your archiving system? Or is that particular card defective. Have you noticed it creating havock on an other device?
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