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I have edited this post in view of recent developments

I have a 2 TB USB Disk used for all my data. I accidentally ran Lion Recovery Disk Assistant on it, instead of my Pen Drive, to make a bootable installer. Now I can't mount the disk.

Disk shows up in Disk Utility Disk Utility Output

Now surprisingly one of the folders showing up from the corrupted USB HD 2TB but the folder is empty

enter image description here

Last login: Mon Jul 18 14:48:54 on ttys000 bash: alias: ll-ls -lahG: not found sanjeevvyas$ diskutil list /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *251.0 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS MacPro HD 250.1 GB disk0s2 3: Apple_HFS Blank 650.0 MB disk0s3 /dev/disk1 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *2.0 TB disk1 /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_HFS ELEMENTS 999.8 GB disk2s2 sanjeevvyas$

Ideally /dev/disk1 should have the same partition structure as /dev/disk2 .I am missing 2 partitions, is there anyway I can fix the partition structure?

I have tried TestDisk, Data Wizard and Disk Drill, however nothing has helped.

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OS X Recovery Disk Assistant v1.0

If you allowed that assistant to complete its work on the wrong disk (with your data) then it's reasonable to assume that hundreds of megabytes of your data were overwritten. However, from your screenshot it appears that the WD My Passport 0820 Media does still contain a VideoUSBPASS1TB volume; so maybe the assistant was unable to proceed with a drive that uses hardware and/or firmware encryption.

I suggest taking advice from Western Digital …

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