[ 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.
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