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It was single MongoD instance.

I think it is gone for good, unless you start using data recovery utilities. You can have a look in the data directory, but I suspect the data files will be gone. The OS has probably marked them as deleted, so it could be possible to recover them - if using windows, try the recover command - there are more sophisticated tools but how important is the data ?

@lisol, sadly he won't be able to. The basics of Block I/O say that everytime there is a Write operation in an empty cluster (a "deleted" file), some bits are damaged of the old file. Unless @kelley_harris has low I/O on the machine, recovering the data will be a waste of time, and effort.