On Jun 24, 2009, at 7:23 AM, John Martz wrote:

>
> On Wed, Jun 24, 2009 at 7:10 AM, Ralph Green<sfrea...@sbcglobal.net>  
> wrote:
>>
>>  As Peter said, the connectors for 2.5" and 3.5" SATA drives are the
>> same.  But, the power draw is almost always a lot more on the 3.5"
>> drives.  A single USB port can supply 2.5 watts(.5 amps at 5V).
>
> My understanding when I read Jeff's note was that his enclosure was
> powered from an external 5v & 12v AC->DC power supply, not from the
> USB port.
>
> What was confusing to me about Jeff's situation is that apparently the
> 2.5" drive worked with USB (and I assumed also with eSATA ... though
> he may not have checked this).
>
> However, when he put the 3.5" drive into the enclosure it did not work
> with USB but it *did* work via eSATA.
>
> If it was strictly an enclosure power supply issue then I would expect
> the 3.5" drive to never work in the enclosure. Or USB to not work for
> either drive.
>
> I can't come up with a good rational for why the 3.5" drive would work
> with eSATA but *not* work with USB, other than possibly the 3.5" drive
> exceeded some GB capacity limit of the SATA->USB adapter/converter??
>
> Oh, well. Maybe it's gremlins? Makes as much sense to me as anything
> else at this point.
>
> -irrational john

Or maybe it's simply that I used the wrong cord (from wall to power  
supply?)... yes, it now works..... Jeff

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