>>
Apart from speed issues, The standard USB port is designed to supply
a maximum current of 0.5 Amps @ 5 Volts. This is equivalent to a 10
Ohm load dissipating 2.5 Watts. Many mainboard (Laptops included)
cannot supply this amount of power.
>>
I was surprised when it worked on the tablet. If I were the betting type, I
woulda lost... :) I was sure it wasn't a bad case or drive when he said it
wasn't powered though.
I rarely plug my drives into the usb ports directly but was surprised when I
plugged the main plug of one drive in last night and it worked. I always use
the second plug and didn't realize it was optional on usb 2. Not that I would
use it with just one - I'd rather be sure it's getting enough power.
>>
I wonder how many service technicians bother to do the checks, or even
know how ?
>>
I don't know about techs, but tech support told him if deleting something in
the registry didn't work, he would need a powered case. They never asked if he
had usb 1 or 2... and had they asked, should have known it wouldn't supply
enough power. He said he asked why they sold it if it wouldn't work without
power and they never answered. <g>
I found an old 1.1 powered hub we're not using anymore and I'm going to give it
to him - along with one of the powered cases I bought the other day. He's
returning the unpowered case.
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