External HD crashed by Disk Utility and all partitions gone

I had a 320GB Seagate external hard drive with 3 NTFS partitions.
They are 200GiB, 40GiB, 38.1GiB
I tried to format the middle partition into an Mac Partition and failed. After that, all partitions are gone and when I plug the HD into a PC, the disk manager recognize the whole space of disk as free.
the Log of the Disk Utility is as follows
2009-06-17 21:38:50 +0800: Preparing to erase : “PERSONAl”
2009-06-17 21:38:50 +0800: Partition Scheme: Master Boot Record
2009-06-17 21:38:50 +0800: 1 volume will be erased
2009-06-17 21:38:50 +0800: Name : “PERSONAl”
2009-06-17 21:38:50 +0800: Size : 38.1 GB
2009-06-17 21:38:50 +0800: Filesystem : Mac OS Extended (Journaled)
2009-06-17 21:38:53 +0800: Error with volume erase Invalid argument
2009-06-17 21:38:53 +0800: Erase complete.
Then a new "disk2" appears in the Disk Utility and can't be ejected easily. There's also something like picasaUpload stuff bumping up during the short formatting.
I tried to recover it using DiskTest 6.11 but it appears to take 14 hr to scan the whole disk and will not necessarily fix the problem.
I have Anyone have suggestion on how to recover the partition? The 200GiB partition is really important for me.

NTFS partitions can not be readily altered to begin with, and when there are multiple such partitions on a drive you should not attempt to alter only one. Since Disk Utility basically can't manage an NTFS partition, when you tried to alter the 'middle partition' (which in most cases is really a 'sub partition' or secondary partition to the 'main' or primary partition) you destroyed the whole of the volume's data structure. Unless you use a data recovery service or use data recovery software yourself, your data is gone. You should not attempt to alter NTFS formatted drives from Disk Utility.

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