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Date: Sat, 08 Sep 2012 14:02:03 -0400
From: "Dieter BSD" <dieterbsd@engineer.com>
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Subject: Re: Disks are 1 sector smaller with USB bridge
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[ ml didn't get cc-ed ]

> ----- Original Message -----
> From: Dieter BSD
> Sent: 09/07/12 11:28 AM
> To: Warner Losh
> Subject: Re: Disks are 1 sector smaller with USB bridge
> 
> > ----- Original Message -----
> > From: Warner Losh
> > Sent: 09/06/12 08:27 PM
> > To: Dieter BSD
> > Subject: Re: Disks are 1 sector smaller with USB bridge
> > 
> > On Sep 6, 2012, at 12:41 PM, Dieter BSD wrote:
> > > FreeBSD reports that disks are 1 sector smaller when connected via
> > > a usb-to-sata bridge than when connected to a sata controller.
> > > This creates a problem when migrating a disk from a sata controller
> > > to a usb bridge, the data in the last sector is no longer accessable.
> > > 
> > > How do I access the disk's last sector when connected via usb?
> > 
> > Which version? I fixed this exact bug years ago, I thought...
> > 
> > Warner
> 
> FreeBSD 8.2 amd64
> Disk is recent Seagate 3TB external, the bridge provides 4KiB
> sectors, but I recall seeing the same off-by-one problem
> with an older bridge with 512 byte sectors. (Don't recall offhand
> what version of FreeBSD I was running at the time.)
> If it matters, bridge is usb3 but host is only usb2.