Quote:
Originally Posted by patrickt
Remember not all USB/USB micro cables are equal. I have a half dozen in a drawer and some will power a Kindle but won't make it appear as a drive. I keep a Kindle cable separate because it will.
There is a reason but not being an engineer, I don't know what it is. I think someone said it had something to do with grounding.
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I think the reason is that: some has only two power cables and some other has an extra two for data: