USB, Toshiba

[Duncan MacGregor]

In my experience, some USB devices do not register unless they go through a 
powered hub that has a power supply of well more than 1 amp. A USB device can 
require 500mA, and some 2.5" drives require more than that.

If a USB device has insufficient power, it may register under  ' dmesg ', but  
not be picked up otherwise. Connecting through a powered hub with, say,  a 
2.5amp power supply solves the problem.


Duncan 

On Tuesday 18 January 2011 12:40:43 you wrote:
> On Tue, Jan 18, 2011 at 12:36 PM, Jason Shaw <grazer-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org> wrote:
> > I would think that it should "just work" by mounting it.  Have you run
> > dmesg when you plug the drive in/power it on to see if Linux notices
> > something plugged in?  Take a look at /dev/ to see if there is
> > /dev/sd[bcdef]1, which should be one letter beyond your optical drive
> > (if you have one).  So, if your hard disk is sda, and optical drive is
> > sdb, then your external drive will most likely be sdc.
> > dmesg is your best starting point though as it will show you the device
> > name so that you can mount it manually.
> > -jason
> 
> Indeed, dmesg is important. I have an external drive that only seems
> to work through the super-short cable that came with it, but not
> through a longer cable or a hub, powered or otherwise. The power light
> comes on but it doesn't get recognized - I suppose the power is
> insufficient to actually make the drive go, blinkenlight
> notwithstanding.
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-- 
Duncan MacGregor  -- Toronto --
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