|vijay shankar, my reaction is if you've truly overwritten the data... sorry 'bout that. However there may be a glimmer of hope. Perhaps the header just got erased and the data wasn't overwritten or at least not all of it. When something is deleted, it isn't actually erased from the disk. Only the header is scratched and the space occupied is marked as 'available for use'. If it hasn't been overwritten, the datum is still there and can be recovered. There's software available (some of it free) designed for that.|
Some commercial recovery outfits can peel back a surprising number of layers if you're willing to pay (sometimes a LOT).
Ed in Texas.