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How come a mini USB drive has 5 contacts when a normal USB drive has only 4 contacts? Answered

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NachoMahmaBest Answer (author)2009-01-29

. Wikipedia is your friend
. Mini uses the extra pin for:
. Pin: 4
. Name: ID
. Description: permits distinction of Micro-A- and Micro-B-Plug (Type A: connected to Ground; Type B: not connected)

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jeff-o (author)2009-01-29

The extra contact is probably connected to ground.

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