Quote:
Originally Posted by HarryT
No, that's not what I was referring to. I meant that whenever an SD card is inserted into your reader, it will draw a (very) small account of power from the device, even when not actually being accessed; this is called the "standby current". It's a tiny amount, but it's not zero. A typical standby current would be about 0.2mA, compared to perhaps 80-100mA when the card is being accessed.
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That's up to the device. The card doesn't require any power when it's not being used-but some devices might send power to it anyway. Others don't. Like I said, it's up to the device.