I have the same problem.
This is the manual udisk command:
$ sudo /usr/lib/udisks/udisks-helper-drive-benchmark /dev/sda 0
udisks-helper-progress: 0.0
read_transfer_rate: offset 0 rate 50121963.552517
udisks-helper-progress: 0.000000
read_transfer_rate: offset 409821184 rate 50161531.921785
read_transfer_rate: offset 819642368 rate 50068291.105993
read_transfer_rate: offset 1229463552 rate 50186590.338347
read_transfer_rate: offset 1639284736 rate 50145967.676659
read_transfer_rate: offset 2049105920 rate 50103384.598795
Error seeking to position -1836040192 for (null): Invalid argument
$ sudo fdisk -l
Disk /dev/sda: 82.0 GB, 81964302336 bytes
255 heads, 63 sectors/track, 9964 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical / optimal IO): 512 bytes / 512 bytes
Disk identifier: 0x92899289
[...]
$ sudo hdparm -I /dev/sda
/dev/sda:
ATA device, with non-removable media
Model Number: Maxtor 6Y080L0
Serial Number: Y3JNVAEE
Firmware Revision: YAR41VW0
Standards:
Used: ATA/ATAPI-7 T13 1532D revision 0
Supported: 7 6 5 4
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 160086528
LBA48 user addressable sectors: 160086528
Logical/Physical Sector size: 512 bytes
device size with M = 1024*1024: 78167 MBytes
device size with M = 1000*1000: 81964 MBytes (81 GB)
cache/buffer size = 2048 KBytes (type=DualPortCache)
Only work with USB stick. Benchmark fail with other HD.
** Package changed: gnome-disk-utility (Ubuntu) => udisks (Ubuntu)
--
Benchmarking in palimpsest fails with "Error seeking to position -1734254592
for (null): Invalid argument"
https://bugs.launchpad.net/bugs/526524
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