Almost all OS'es do not wipe the hard drive when deleting files. On a Hard drive, Directory locations are stored in a File Allocation Table and a special bit is set to "Not used any longer." There are a ton of free hard drive editors online, I think Hirems has one, that will let you read the File Allocation Table and reset that bit. The Directory names are in Ascii, so you can search for that name.

I do hope that the server was powered down as soon as the error was noticed. If it is still active it will overwrite the directory location and all data will be lost with out spending big bucks to possibly recover some of it. The longer it runs the more data is overwritten and the cost to recover increases logarithmically.

Make a pot of strong coffee and
https://duckduckgo.com/?q=recover+ha...ve+data&t=ffsb
https://duckduckgo.com/?q=recover+de...ve+data&t=ffsb