dear experts:

quick hardware question:  is power additive?  that is, assume I have a 1A 
USB 5V adapter installed.

if I now add a standard powered USB 2.0 connection (0.5A) to my (1A) USB 5V 
cable, does the BBB now have 1.5A?

my hard drive shipped with a y-cable, that presumably helps it to draw 
500mA*2.  if I connect it to the BBB, can it draw 2A then?  (or, if I only 
connect it, can the BBB draw 0.5A or 1A).

/iaw



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