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Power draw of the drive excedes that available via USB port? Kinda hard to imagine me pushing the 400gig externals I use for removeable backups from a USB power stream...

Don in DC



At 05:27 PM 12/28/2005 -0600, you wrote:
Folks:

Anyone know why some external USB hard drive chassis need external power
and some don't?

A few months ago I bought a USB 2 drive chassis for a 2.5" laptop drive.
 I was quite disappointed when I found out it required either two USB
connections or a power brick (larger than the drive itself).  I returned it.

The other day I found a similar drive chassis that didn't have a power
plug.  It took it's power directly from the USB bus.  I picked it up
($25 at compusa) and it works fine.

So my question is ... why did the first one require extra power and the
second one doesn't?  They were both driving the same hard drive.

Thanks!

david



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