I'm running Ubuntu Server 12.04, and basically found out that a couple of files aren't behaving like they should. The file name is r.-1.-1.mca, and I've tried using this terminal command sudo cp r.-1.-1.mca ../ The hard drive is working/thinking for a while, then spits this back out: cp: reading `r.-1.-1.mca': Input/output error cp: failed to extend `../r.-1.-1.mca': Input/output error I have another file behaving like this. My guess is that these files are corrupt, so I tried running the server in recovery mode and it told me to check the file system. However, it didn't come up with any errors. Is there a way to repair these files so I can use them normally again?