Bytecc 2.5" External Drive Enclosure - bus power supplies enough juice?
Lennart Sorensen
lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Wed Mar 8 19:12:17 UTC 2006
On Wed, Mar 08, 2006 at 01:07:48PM -0500, Madison Kelly wrote:
> IIRC, Bytecc use a horrible chip which often locks up hard when you
> start a transfer of any decent size. I can't think of the chipset off
> the top of my head though, sorry. My personal opinion is to stay *far*
> away from Bytecc... they're cheap for a reason.
>
> On the other hand, I have had good luck with Vantec's line, though I
> have only used their 3.5" carriers. Generally speaking though; any
> carrier that draws power from the USB bus will need ~500mA which is more
> than the spec allows (350mA/channel). To get around this they generally
> give you a USB pass-through cable that provides extra power for the
> drive. These pass-throughs should only be put in between low-power or
> self-powered USB devices (ie: a mouse).
>
> The real test is to look at the power draw on the hard drive you want to
> use and add ~20/30mA for the controller. Then see if one or two ports
> will provide enough power for you.
I thought USB 2.0 increased the power limit over what USB 1.1 allowed.
I have certainly read of needing the extra cable on USB 1.1 systems
while not needing it on USB 2.0 systems.
Len Sorensen
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