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On this SATA cable, for what is the lug on the one plug? I think the "lock" (that the physical connection is more stable) is managed by the silver metal. But the lug? I haven't any idea for what this should be in practice.

sata cable with lock and lug

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On the right angle connector, presumably to make it easier to hold and handle, though I've never seen one with that extension. Considering it's a low profile variant of SATA, it does seem a little odd.

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IMHO: If you pull on the plug body it would twist the connector in the socket, the extension gives you a straight pull to remove it & reduces chance of damage to the socket. –  BrianA Mar 3 '12 at 12:30
    
Mine don't have the extention. Works fine. Thats the obvious purpose of it quite certainly. –  Journeyman Geek Mar 3 '12 at 12:49
    
@BrianA don't you still need to push up on the metal clip on the connector anyways? –  Breakthrough Mar 3 '12 at 23:43
    
Squeeze, actually –  Journeyman Geek Mar 3 '12 at 23:45
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