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s/v Jedi · 25-03-2009, 21:59

Not ghost ports, many are used internally like for the audio section, card reader etc. They might also have pin-headers for the rest on the motherboard. It might also be that they only have the power available for 2 ports so they don't use the other 6.

Voltage drop over longer cable: yes, but the spec takes that in consideration. Also, the longer cables (should) have bigger diameter cores to counter that.

USB ports should be able to supply 500mA and should survive if you try to draw more. But I also saw many burned out ports (not just the fuse blown). You may well be right that newer laptops don't have the problem.

cheers,
Nick.

25-03-2009, 21:59	#98
s/v Jedi Registered User Join Date: Feb 2009 Boat: Sundeer 64 - Jedi Posts: 1,519	Not ghost ports, many are used internally like for the audio section, card reader etc. They might also have pin-headers for the rest on the motherboard. It might also be that they only have the power available for 2 ports so they don't use the other 6. Voltage drop over longer cable: yes, but the spec takes that in consideration. Also, the longer cables (should) have bigger diameter cores to counter that. USB ports should be able to supply 500mA and should survive if you try to draw more. But I also saw many burned out ports (not just the fuse blown). You may well be right that newer laptops don't have the problem. cheers, Nick.