Disk Utility fails when formatting a drive

Hi, I have been having problem with Disk Utility when formatting a drive. Every time I format a drive, regarding of what volume format I choose, it will start the format and then fail shortly after.
The drives are then no longer mountable and Disk Utility will not be able to see the drive any more.
Can some one tell me why this is failing? I have only ever experienced this problem on my Mac Pro.
Thanks

Thanks, The Hatter. Sorry I didn't include the internal drive information because so far, I have been using disk utility to format external drives and every time I tried to use it to format, it will fail (have not tried to format an internal drive as I only have one internal).
This is the detail of my internal drive.
Capacity: 298.09 GB
Model: WDC WD3200AAJS-41VWA0
Revision: 58.01D01
Serial Number: WD-WCARW3484394
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Bay Name: "Bay 1"
Mac OS 9 Drivers: No
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified
I have tried connecting external drives via, USB and Firewire. Have tried formatting drive to MS-DOS (Fat 32) or MacOS Extended and nothing works.
Please let me know if you need any more info.

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rpignard wrote:
Any advice or ways to fix that once and for all ?
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DaddyPaycheck:
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Carolyn:
*Are you referring to the com.apple.DiskUtility.plist?*
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To dechamp :
HD is connected with a FW hub. maybe it is the problem :/
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↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

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