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External USB 3.0 hard drive question

post #1 of 7
Thread Starter 
Since USB 3.0 provides power why do I still see external hdd coming with a power brick? Like this 3TB WD My Book Essential?
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post #2 of 7
I think it is because it only still supply only the 5v not both since the larger drives require 12v and 5v to operate. I am assuming they didnt add in a 12v power line also due to making it backwards compatible with the older versions. I do know all they did was increase the amps from 500ma to 1500ma...
 
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post #3 of 7
It might need additional power if on USB2.0?
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
It might need additional power if on USB2.0?
Good point, I guess I'll find out next week.
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post #5 of 7
My friend just bought one of the new WD 500GB USB 3.0 external's that runs off only the USB (forget what they're called. Passport or something like that?) and even with taking power off the usb port it still transfers faster than my usb 2 1.5tb seagate external.
post #6 of 7
Thread Starter 
Quote:
Originally Posted by Shiveron View Post
My friend just bought one of the new WD 500GB USB 3.0 external's that runs off only the USB (forget what they're called. Passport or something like that?) and even with taking power off the usb port it still transfers faster than my usb 2 1.5tb seagate external.
It's called on/off charge ports. USB 3.0 is supposed to be faster than USB 2.0 because of USB 2.0 bottleneck of 480Mb/s.
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post #7 of 7
All 3.5" external drives need external power.

Always did and will for the forseeable future.

All 2.5" drives can be powered by USB but some may need a "Y" cable to use the power from two USB ports simultaneously.
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