Lost ALL data from SanDisk Micro Cruzer

I admit, I removed the drive incorrectly while in a hurry.  I replugged back into my computer & the drive was not formatted.  I reformatted the drive & tried to use some recovery programs have given the error messagesm such as:  No file system fragments found / unable to find partitions and the event log has several messages saying error in processing partition driver at sector/cluster 1 or other cluster numbers listed. 
Can the data be recovered?  I've tried several programs but maybe I've missed something.  Do I need to do something else to the flash drive?
Any help would be greatly appreciated.  Thank you.