I'm relatively new to minecraft and my computer shut off unexpectedly earlier while i was playing, upon logging back on i was most distressed to find that my world had been deleted. well i went into my .minecraft folder and all of the world data appears to be there the client isn't able to read it however.
I can't help with world recovery but the shut down was due to major overheating. usually either a bug or graphics card.
I can't help you with recovering what you've lost although there is definitely a way to get some back, i've read online about some but I just thought I'd share with you all what i've done to at least help avoid this in the future somewhat.
open up notepad and create a batch file that will first copy the level.dat file to a backup folder of your choosing. and then opens the game. And instead of running your usual exe file to open the game, instead run this. That basically means that every time you run the game, the level.dat file is backed up and you will only lose 1 session of game time at most.
to do this, open up notepad
type this
copy C:\Users\*user name*\AppData\Roaming\.minecraft\saves\World1\level.dat C:\*wherever you want*\level.dat
*new line*
c:\*wherever minecraft is stored*\Minecraft.exe
save the file as RunMinecraft.bat <-- make sure you put .bat instead of .txt
test it out, if it doesn't work make sure your directories are named and formed correctly
if u didnt have a folder backup...
the .minecraft/saves/worldx/ folder it usually has a backup of the level.dat. (ie. level.dat_old, level.bak etc depending on what editors you have used.)
in windows vista/7 u can right click the file > "restore previous versions" which pulls it from a system restore. thats if Sys restore is on. the one in xp almost never works.
i dont recommend it but in some cases if ur real desperate u can create a new world and copy the level.dat from that world and paste it into your broken world.
Hey I have had the same Problem- due to over heating my computer shut down unexpectedly and my world was lost, I think I vaguely understand what you guys are saying but I'm not really very good with computers can you explain this to me a little simpler- Thanks for your help
The same thing happened to me, I was playing Minecraft and BOOM! Sudden blackout, luckily it was my skin testing save.
If Your Computer Shuts Down It Means Your Graphics or Video Card Isnt Good Enough and is overheating it happened to me its because my fan snapped off for it though :)
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the error seems to be with the level.dat