Partition Table Corrupted on External USB drive

Hi


I have managed to corrupt the partition info on my USB HDD
the HDD is 465GB and I was moving (silly me) data onto it.
Went off to do stuff. Came back to check data and I can no longer access the drive. Windows explorer sulks and reports X:/ is not accessible. The parameter is incorrect
Disk Management reports 2 partitions (there was only one) of 40Mb and 100MB and the rest (465GB) unallocated
EaseUS partition recovery reports 2 partitions 465GB, 100 Mb and 465 GB unallocated

This looks sensible (in that the original drive was 465GB)

So how can I rebuild the original partition table and hopefully recover the data?
TFAI

Partition table: Well its a 465Gb disk now showing 2 partitions of 465Gb and another of 100Mb so its hard to see what else it might be.
Ive tried EASUS partition recovery and it did nothing. Not too surprising since there were no lost partitions - just suspected corrupt partitions
The data recovery tool identifies some of the lost files and is a start but still does not repair the partition table and the recommended solution (save what you find and re-partition the HDD) is likely to destroy any chance of recovering the rest.


For a given HDD I wold expect the partition table to be 'standard' and am surprised there isn't software that will repair and existing table.

Thanks - will try some other tools

And where/how might it find the partition table backup?

Thx I'll give it a go.
But most of these seem to work at recovering a deleted partition not repairing an existing partition.
I was playing with DiskInternals partition recovery and it all looks fine, identifies the partition informaiton on the disk but will only search for files as opposed to repair the partition table.
Or is this not possible/practical?

Done the recovery bit. Got some useful stuff but not much. I suspect most of it lies in the 465GB unallocated

So you reckon I should use a partition manager to delete the existing partitions and then try to recover them? Seems a bit Irish. If it works, it will get me back to where I am!
I could delete them all and create 1 new one but that will surely screw everything up (if it isnt already!)