When I try to format an external usb drive  the progress bar only goes half way then freezes up can anybody help please

When I try to format an external usb drive  the progress bar gets to half way then freezes , or stops and  what ever time I allow it never gets any futher on , I have to go to the task bar and click quit  to get on  and the usb drive is not formatted  is there a fault with my disk utility program  I have updated the system
to lion 10.7.2
Can anybody advise please

Are these new external drives? How are the currently formatted? Have you tried doing this:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.

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