I have the same problem on multiple drives, multiple systems. The only thing that changes is the offset. On a 3 Terabyte drive attached to an internal interface with GUID partition table (model WDC WD3001FAEX- 00MJRA0 (01.01L01)) I get: Error seeking to offset 30005927936 (g-io- error-quark, 13).
On a USB 2.0 connected Hitachi 82.3 GB drive with no partition (model TOSHIBA THNSNH128GBST (HTRAN101)) The R/W benchmark actually started but then I got: Error seeking to offset 2470412288 (g-io-error-quark, 13). This is interesting as the drive label indicates the total sectors are 160836480. Disconnected and reconnected this drive and then got: Measuring transfer rate (0.0% complete)… and it hung. 3rd attempt on this drive duplicated first results. We appear to be seeking beyond extents. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-disk-utility in Ubuntu. https://bugs.launchpad.net/bugs/1081019 Title: Benchmark for Harddisk fail Status in “gnome-disk-utility” package in Ubuntu: Confirmed Bug description: I can not benchmark any harddisk I have. I tried with unmounted, usb-connected harddisks. Steps to reproduce: 1) Start gnome-disks 2) Select a Harddisk and unmount all partitions so the disk is not in use 3) Select "more actions..." button and then the point "Benchmark volume..." 4) Run "start benchmark..." and use the default settings and press the new button "start benchmarking" Now I get: Error seeking to offset 10002022400 (g-io-error-quark, 0) ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: gnome-disk-utility 3.6.1-1ubuntu1 ProcVersionSignature: Ubuntu 3.7.0-2.8-generic 3.7.0-rc5 Uname: Linux 3.7.0-2-generic i686 ApportVersion: 2.6.2-0ubuntu5 Architecture: i386 Date: Tue Nov 20 09:29:43 2012 InstallationDate: Installed on 2012-06-16 (156 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423.2) MarkForUpload: True SourcePackage: gnome-disk-utility UpgradeStatus: Upgraded to raring on 2012-11-12 (7 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-disk-utility/+bug/1081019/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

