This product is worse than useless. After I bought it, I read several reviews panning it. I bought it for backup of graphic files, especially photos. After I spent some time organizing my files and backing them up to the Cavalry external hard drive, I tried to transfer the files to another, internal hard drive. I kept getting read errors and having to start over. Fortunately, I was able to preserve the data by being persistent and copying small segments at a time. I haven't used the hard drive since.