Nokia 8gb memory card problem ( semi-empty )

Question

just had a 5800 two weeks ago with a memory card 8gb, it already had some music but i add my own and other stuff and it was cool, i do this by removing the card from the device and put it in a memory card reader and into the usb, one day which is today, i did this to manage some stuff then what happened, the usb connection was last and back again in one second, so i changed te usb port and put it in another one, then what i found is there is nothing, all files and folders gone, there is only one big dump file has the size of 4gb (the size of all the things that should be), 4gb in one file that has no type or any thing its just a file with 4gb which is the size of the music and videos and the stuff that was in the card, so that means that the files supposed to be in the memory card but its stuck in one file, so whats going one i mean, thats it? all files are gone? and what is that big file? even if i give up the memory card will only have 4gb left cuz the file cannot be deleted or moved, by the way the file name is weird but this is the name: USBC╨†┘à.
thnx for reading, by the way, the files that was in the memory were very important to me, i spent alot of days collecting those stuff and there are other things such as photos and stuff that i will never had if the memory is gone, when i found out nothing in the memory i lost consciousness for about an hour on the floor.
waiting for replys

Answer 1

Hi ,i just encountered this problem while moving files ,all files
lost except the USBC file from SDHC card.so i ran several recovery
soft. .nothing works.i have successfully recovered those files .
use memory card reader.open command prompt,change to that
drive .use chkdsk /f first .then chkdsk /r.if chkdsk /r ran
properly (in my case i got read error first ,trying second time it
shows the progress),it will show chkdsk found no error.
it will show how much space is taken in how many files and folders
and how much space is free.in may case it was 615 mb in 136
recoverable files.yours may be different.in the SDHC there was a
single file named USBC.Choose option show hidden folders AND show
system files in explorer menu.there will be a directory named
"FOUND.000" like that.there will be files that were lost inside it
with extension CHK.
in my case i changed their ext. to JPG.i got my files.but
in your case these files should be renamed according to their
original name & ext.