I am not sure weather there is a simple solution to this, but i'm hoping....
I have a 1Tb wetern digital network external HD WD10000G032. It lost all of the shared/subfolders in it and I can no longer see it in my network. I was able to log into it from I.E. at 192.168.1.103. When doing this I could see the details of the volume and it still showed it at 82% full. From here it would let me create any new shared folders but they would not show up anywhere.
Cutting to the chase, I removed the HD and put it into my computer. The computer installed the drivers to use it, but as I expected, it did not show up as a usable drive in disk management. In order to give it a drive name (big mistake) I converted it into a dynamic disk, at the advice of a friend. Now, it, and all the partitions, have drive letters and the computer wants to format them. The format for the entire volume is RAW and not FAT32 or NTFS.(I did not do a format) I put the HD back into its case. Upon power up I can hear it spin but get no lights or other signs of life. I cannot find it or log into it. Any suggestions on how to proceed without loss of data?
I think you will find that the drive has been set up with Linux partitions and file systems (ext2 or ext3). The embedded server will most probably be based on Linux code. Part or all of this code will reside in flash memory of the mainboard inside the enclosure. The main controller IC will bootstrap itself from flash memory, and this boot code may then retrieve more code from a dedicated partition on the HDD.
By writing to the drive in a Windows environment, you would have undoubtedly overwritten part or all of sector 0. At the very least you will have created a new partition type, 0x42. IMHO I would refrain from using any data recovery tools until you have examined the damage. To this end I would use a disc editor in readonly mode to dump sector 0. If you would like to try that, then I would be prepared to help you, if I can.
Otherwise here are several possible data recovery options, both freeware and commercial:
One other avenue may be WD's forums. Alternatively, if the product does indeed incorporate Linux code, then under the terms of the GNU licence agreement, WD will have been required to make the code publicly available via download.