From owner-freebsd-usb@FreeBSD.ORG  Sat Aug 21 16:00:14 2010
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From: Hans Petter Selasky <hselasky@c2i.net>
To: indulekha <thebeelzebubtrigger@gmail.com>
Date: Sat, 21 Aug 2010 17:56:26 +0200
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Cc: freebsd-usb@freebsd.org
Subject: Re: USB HDD needs replugging?
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On Saturday 21 August 2010 17:37:18 indulekha wrote:
> On Sat, 2010-08-21 at 17:18 +0200, Hans Petter Selasky wrote:
> > > Yes, there is a dmesg error:
> > > 
> > > ugen4.5: <(null)> at usbus4 (disconnected)
> > > uhub_reattach_port:435: could not allocate new device!
> > > 
> > > But then just a few lines later, dmesg says:
> > > 
> > > ugen4.5: <Seagate> at usbus4
> > > umass1: <Seagate Portable, class 0/0, rev 2.00/1.30, addr 5> on usbus4
> > > umass1:  SCSI over Bulk-Only; quirks = 0x0000
> > > umass1:3:1:-1: Attached to scbus3
> > > da1 at umass-sim1 bus 1 target 0 lun 0
> > > da1: <Seagate Portable 0130> Fixed Direct Access SCSI-4 device
> > > da1: 40.000MB/s transfers
> > > da1: 305245MB (625142448 512 byte sectors: 255H 63S/T 38913C)
> > > 
> > > I'm thinking there's some sort of power management scheme in the
> > > Seagate that umass has trouble accommodating.
> > 
> > Does your USB device have a separate power supply?
> > 
> > --HPS
> 
> No, it's one of those pocket-sized HDDs.
> This one, actually:
> http://www.amazon.com/gp/product/B001SJZV10/ref=oss_product

Hi,

Try to use an external self-powered USB HUB and see if the problem is the 
same.

--PS