Windows borked my external drive's partition map

I have two partitions on my 1 TB external drive, a ~750 GB HFS+ partition full of huge files (games, iTunes, etc.) and a 150 GB NTFS partition for Steam games (derp TF2 derp). The hard drive was originally in GPT, but now is in MBR due to Windows being... unkind.
While trying to create the NTFS partition, Windows 7's Disk Management asked me to convert the partition map to a "simple" partition scheme. I obliviously clicked OK and let it do its thing, then moved my Steam games over to the new NTFS partition and played TF2 for a few weeks. When I finally rebooted into OS X, I wondered why the two partitions weren't appearing on my desktop, and so I opened up Disk Utility, looked at my external HD's description and immediately started spewing out expletives. The disk reported as having one 1 TB "Windows_LDM" partition (Windows says otherwise, with the NTFS partition being recognized and the HFS+ not appearing anywhere) with MBR instead of GPT.
Disk Warrior and Drive Genius both refuse to do anything, since it doesn't report an HFS/HFS+ partition. Disk Management in Windows won't let me change it back to GPT. Be there anything I CAN do?
Here's the DU Command-I output of the HD:
Name : WD
Type : Disk
Partition Map Scheme : Master Boot Record
Disk Identifier : disk1
Media Name : WD My Book Media
Media Type : Generic
Connection Bus : FireWire
Connection ID : 40718345779727391
Device Tree : IODeviceTree:/PCI0@0/PCIB@1E/FRWR@3/node@90a91ea80acc1f/sbp-2@c000
Writable : Yes
Ejectable : Yes
Location : External
Total Capacity : 1 TB (1,000,204,886,016 Bytes)
S.M.A.R.T. Status : Not Supported
Disk Number : 1
Partition Number : 0
And of the "partition":
Name : disk1s1
Type : Volume
Disk Identifier : disk1s1
Mount Point : Not mounted
Connection Bus : FireWire
Device Tree : IODeviceTree:/PCI0@0/PCIB@1E/FRWR@3/node@90a91ea80acc1f/sbp-2@c000
Writable : Yes
Capacity : 1 TB (1,000,203,836,928 Bytes)
Owners Enabled : No
Can Turn Owners Off : No
Can Be Formatted : No
Bootable : No
Supports Journaling : No
Journaled : No
Disk Number : 1
Partition Number : 1
...Help?

You cannot convert the drive's partition map back to GPT without repartitioning the entire drive. I doubt you can change it even using a Windows or Linux partitioning tool. Even if you could the other partition is probably lost.

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