AEBS sees drive, but not the partition on it

Hi folks,
I try to connect a WD 1TB SATA2 drive in a Fantec USB enclosure* to my Airport Extreme Base Station. I have tons of stuff on the drive, "unified" from various older external and internal drives.
Now, while Airport Utility "sees" the physical disk in the list of Airdisks, it does not actually mount the single HFS+ (Journaled) formatted partition/volume on it.
1) It mounts nicely on my MacBook Pro, and I can also access it using MacDrive on my PC.
2) I checked it using Disk Utility, everything is fine.
3) I even checked it in Disk Warrior, and rebuilt the directory structure for good measure.
4) The partition's name is only 14 characters, no spaces, no High ASCII characters.
5) It mounts without problems on my Win XP PC with MacDrive 7 via USB.
I tried rebooting the AEBS, but no success. Another, older 250 GB external drive (also HFS formatted) connected fine, the volume immediately appeared in Airport Utility, no restarting necessary (sadly it's an IDE enclosure, not SATA).
*The Fantec enclosure uses a JMicron JM20336 SATA to USB chipset, if anyone cares to know.
EDIT: latest Mac OS, latest AEBS firmware 7.3.2, latest Airport Utility on Mac and PC, etc.
I'm stumped, why can't the AEBS see the volume?
I hope anyone has an idea what's wrong. Maybe the enclosure is not compatible with the AEBS?

Ok, I had the chance to test another SATA drive in the same HD enclosure, and Airport Extreme recognized the drive. It was formatted as FAT. Other partitions on the same drive were formatted NTFS, and the Airport warned me about a faulty disc.
In any case, it is now verified that it is not the enclosure, but seemingly the drive itself that isn't recognized by the AEBS.
Next, I did various tests to see what is wrong. Remember, this is a brand new 1TB Western Digital Green (3 platters, the most recent model). Other (smaller) drives in the same or other enclosures work fine.
*Test 1:* format the drive using HFS (Journaled)
Expected result: partition should mount as volume with name "xD".
Actual result: partition does not mount (as can be seen on the screenshot)
!http://666kb.com/i/b631xlvxyii0kboty.png!
*Test 2:* format the drive as NTFS using MacFUSE
Expected result: error alert by AEBS (faulty drive)
Actual result: no luck (see screenshot above)
NOTE: At this point, I didn't have the option in Disk Utility to format as FAT - I don't know why.
*Test 3:* format the drive as NTFS using a Windows XP PC using the Management Console
Expected result: error alert by AEBS (faulty drive)
Actual result: error alert by AEBS (faulty drive)
NOTE: After this test, the option in Disk Utility to format as FAT has reappeared. Maybe formatting in XP fixed some partition table error? Or the disk is now formatted in MBR mode rather than GUID?
*Test 4:* format as FAT (using Disk Utility)
Expected result: mount the partition
Actual result: partition mounts! As you can see in the screenshot, the volume name is "XD" instead of "xD" because FAT only supports upper case volume names.
!http://666kb.com/i/b632kbz0xp0lihk6u.png!
*Test 5:* format the drive as HFS (Journaled) again
Expected result: mount the partition
Actual result: Disk Utility fails to delete the FAT partition (see screenshot)
!http://666kb.com/i/b632se0dzj9fknwxi.png!
At this point, I am trying a few things to delete the FAT partition. First, I reformat using FAT, which succeeds. Formating as NTFS also works. I click on the drive icon rather than the volume icon, and see that the disk IS using the Master Boot Record scheme. I guess this is why I can't format the partition as HFS...
*Test 6:* re-partition the drive with 1 HFS (Journaled) partition, this time specifically setting MBR as scheme.
Expected result: formatting will fail, because I guess HFS doesn't work on MBR partitioned drives
Actual result: yup, Disk Utility fails to do this
*Test 7*: re-partition the drive, using GUID with 1 HFS (Journaled) partition
Expected result: partition mounts
Actual result: partition mounts - SUCCESS!
!http://666kb.com/i/b633840bd5mkinjw6.png!
CONCLUSION:
If a drive fails to mount in AEBS, there is most likely something wrong with the partition table. Try repartitioning the drive (either using GUID or MBR) and see if this fixes the problem.
Hope that helps,
Stefan

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