Toshiba USB HD

[John Summerfield]

Mikkel L. Ellertson wrote:
> dasd wrote:
>> On Thu, 8 Nov 2007 10:29:05 -0500
>> "Kip Thomas" <kip.thomas at gmail.com> wrote:
>>
>>> I'm taking a stab at it.  You said HD but I'm guessing a CDROM?
>>>
>>> I guess you don't see an icon on your desktop where you can mount or
>>> access files in the CD.
>>>
>> Thank you pal, for replying so soon. But, in the mean time, my problem
>> got autosolved. Just by chance, I plugged it to a differnt USB slot,
>> and it got recognized, mounted and all. Sorry that I bothered you with
>> it. 
>>
> It sounds like ether the first socket didn't have enough power. With
> USB hard drives that are powered off the USB bus is that you have to
> let the drive spin up before things work correctly. I have two

A USB CD-ROM would have to be self-powered; I'm yet to see even a 3.6" 
drive enclosure that's not.


> laptop drive enclosures that are powered this way, and I have to
> plug in the power-only plug and let the drive spin up, before
> plugging in the data plug. I also have a couple of 3-1/2" drive
> enclosures that have their own power supply. Most of them requiring
> turning on the drive power supply before plugging in the USB plug. I
> do have one that works fine plugging in the USB plug before turning
> on the power. But that one does not show up in lsusb before turning
> it on. I gues sit depends on how the electronics are powered, and if
> the firmware handles the drive powering up after the USB interface.

The order of turning on power should not matter. After a power 
failure,them drive is almost certain to be up first. OTOH I'd not wish 
to remove the USB cable to power off/power on a drive (I may want it 
connected over time, but not necessarily with power).


-- 

Cheers
John

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