What is with the original wallet file?
Even if you deleted it on your harddrive it is most likely still there. There is recovery software for this case. eg.
http://www.krollontrack.com/data-recovery/Probably you can also recover it from the usb drive. But i would recommend a backup of the broken stick first. Easy with dd under linux. Then try to fix the partition with fsck.
If you can't get your wallet file back your coins are lost.
It could be a high effort needed to restore that file. Is it worth it?