Hello, everyone! I have some troublesome hard drive problems and hope you can help me out! Several days ago, my external hard drive was borrowed by my friend for some data transformation. However, after that, every time I attempted to use this drive on my Mac, an error message would be given and asked me to format it at first. But, many of my important files were still stored there. I cannot directly format it. So, I checked the Properties. Everything seemed well, except that the file system was changed into RAW. Do you know something about the RAW problems? How can I get back my important files from this RAW drive without formatting?