I've been trying to move files from my hard drive but when it reaches half way it will suddenly pause and the copying sign turns red then it will hang. So i thought the hard drive just couldn't handle too many files (though i know it doesn't make sense because i still have more than 300GB). I could deleted some files but some says "error" or "could not read files" but when i try to open the file, it works fine. I tried using another laptop but the issue is still the same. I could not have courage formatting my hard drive because all files are just too important for me. Please help me what to do.