Can't unmount a removable hard disk it automatically remount

hi,

While I try to unmount (gnome eject) my removable hard disk (usb interface), I got that message and after it automatically remount the device.

English :
Writing data to device
There is a data needs to be written to the device <devicename> before it can be removed. Please do not remove the media or disconnect the drive.
http://zebioman.free.fr/pixmaps/eject_error.png

French :
Ecriture des données sur le périphérique
Il existe des données à inscrire sur le périphérique <devicename> avant de le retirer. Veuillez ne pas retirer ni déconnecter le disque

There are several persons that have the same problem in Feisty with different file system too.
Here the syslog under ubuntu Feisty (device open at 09:56:17, eject at 09:58:34 and thats all !) :

Apr 20 09:56:17 bioman hald: mounted /dev/sdb1 on behalf of uid 1000
Apr 20 09:58:34 bioman hald: unmounted /dev/sdb1 from '/media/disk' on behalf of uid 1000
Apr 20 09:58:35 bioman NetworkManager: <debug info>^I[1177055915.263404] nm_hal_device_removed (): Device removed (hal udi is '/org/freedesktop/Hal/devices/volume_uuid_e08ceda2_03bd_4809_9d56_f7b8c8df9ab2').
Apr 20 09:58:35 bioman kernel: [ 7481.169625] SCSI device sdb: 490232832 512-byte hdwr sectors (250999 MB)
Apr 20 09:58:35 bioman kernel: [ 7481.390181] sdb: Write Protect is off
Apr 20 09:58:35 bioman kernel: [ 7481.390190] sdb: Mode Sense: 1c 00 00 00
Apr 20 09:58:35 bioman kernel: [ 7481.390192] sdb: assuming drive cache: write through
Apr 20 09:58:35 bioman kernel: [ 7481.390474] sdb: sdb1
Apr 20 09:58:36 bioman NetworkManager: <debug info>^I[1177055916.066526] nm_hal_device_added (): New device added (hal udi is '/org/freedesktop/Hal/devices/volume_uuid_e08ceda2_03bd_4809_9d56_f7b8c8df9ab2').
Apr 20 09:58:36 bioman kernel: [ 7481.609693] ReiserFS: sdb1: found reiserfs format "3.6" with standard journal
Apr 20 09:58:36 bioman kernel: [ 7481.609902] ReiserFS: sdb1: using ordered data mode
Apr 20 09:58:36 bioman kernel: [ 7481.645948] ReiserFS: sdb1: journal params: device sdb1, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
Apr 20 09:58:36 bioman kernel: [ 7481.647088] ReiserFS: sdb1: checking transaction log (sdb1)
Apr 20 09:58:36 bioman kernel: [ 7481.661901] ReiserFS: sdb1: Using r5 hash to sort names
Apr 20 09:58:36 bioman hald: mounted /dev/sdb1 on behalf of uid 1000

additional informations :
-------------------------------
Ubuntu Feisty Fawn 7.04
Gnome version 2.18.1

The following command :
sudo gnome-mount --eject /media/disk
report "gnome-mount 0.5" but the device is not unmounted.

I also tried with the Firewire interface (my device support both USB and Firewire) and it can't unmount too.
This bug has been reported here too http://bugzilla.gnome.org/show_bug.cgi?id=431991