Hey John,
You are right on the money with that!!! I always use the power cord no
matter what I'm running with mine because I don't want any problems... CoolKat
-----Original Message-----
>From: iJohn <zjboyguard-ggro...@yahoo.com>
>Sent: Sep 7, 2009 11:47 PM
>To: g3-5-list@googlegroups.com
>Subject: Re: USB 4-Port Hub
>
>
>On Mon, Sep 7, 2009 at 10:14 PM, Stephen Conrad<khel...@gmail.com> wrote:
>> So, I plugged in (via USB) my USB Hub and I plugged in 2 USB Thumb
>> Drives (a 2 GB and a 247 MB one (according to the Get Info command)
>> but when I tried to plug in a 3rd (512 MB drive) it gave me a Low
>> Power Warning.
>
>If the question is how many devices can your hub support when it
>powered only by its connection to your computer, the answer would be
>"it depends" on what devices you plug into the hub.
>
>By spec, a single USB port (whether v1.1 or v2.0) can only be expected
>to provide a max of a 0.5 amp. So there is at most 0.5 amp of current
>available to run the hub and any other devices that you plug into the
>hub.
>
>Now if the devices you attach via the hub are all very low power, then
>this won't be a problem. But it appears that it takes more than a 1/2
>amp of current to power the hub plus the 3 USB flash drives you tried.
>
>> the folks at Rat Shack (Radio Shack) said it can run off the USB bus
>> and I can use it with 4 thumb drives.
>
>Unless I'm missing something here, I think they are just plain wrong about
>that.
>
>The most common place people run into problems with the 1/2 amp
>restriction for a USB port is when they attempt to power a 2.5" drive
>from a single USB port. For some drives this is just not enough
>current to let the drive spin up. This is why they came up with the
>(slightly wacky) cables which let you plug the drive into two USB
>ports. One of the ports is used for both data and power while the 2'nd
>is used just for power. Supposedly you can get 1 amp of current if you
>combine two USB ports which should be enough for any 2.5" drive.
>
>If you want to ensure that you can use all four ports on your hub
>you'll either have to power the hub another way or use devices that
>require less current.
>
>No?
>
>-irrational john
>
>>
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