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From: Hans Petter Selasky <hselasky@c2i.net>
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Cc: freebsd-usb@freebsd.org
Subject: Re: USB HDD needs replugging?
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> 
> 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