My passport drive suddenly became insanely slow. It didn’t fall or get hit, just suddenly stopped working properly. It takes a really long time for files to show up in the finder and video files lag. I can transfer files off the disk successfully, but transferring anything onto the disk fails with an error about files not reading or writing properly. In the Mac Disk Utiity I ran the Verify Disk and both partitions were reported to be OK. However, in the Smartware app both Quick SMART Status and Quick Drive Test fail. I’ve tried buying a new cable, but this did not fix the problem. The USB ports work fine with the other ext HD I own. Any suggestions?