Hello, about 2 years ago I purchased 2 identical 4TB My Passport Ultra drives. I use one as a main drive and the other as a backup. I hardly use them, just every few months to backup data and they both had been working just fine until yesterday. I was trying to copy a 1.6 GB file to the main drive and noticed that the initial 1GB or transferred very fast but then the rates would drop painfully slow to 2MB/sec or so. I then disconnected the drive and connected the backup drive and copied the same file. The file finished transferring in just 5-6 secs. Obviously there is some problem with my main drive. I just can’t figure out what it is though. I even checked the policies on the drive and it was set to quick removal (which is the default on Windows 7 and that is what it is set to both my drives). I even tried the Better performance option but did not have any luck.