I've been having a lot of slow downs and beach balls lately. World of Warcraft over the last few days has become mostly unplayable. A couple nights ago it froze for 4 minutes. I started thinking there was something wrong with my hard drive. I have two backup drives that were cloned with Super Duper, but I was afraid to update them if there was something wrong. So, I just decided to copy the files that I know have changed. It was then that I started experiencing a new problem. These folders that were a 200MB-1GB in size stalled at 70MB each time and sat there for several minutes before slowly finishing copying to my thumb drive. As a test, I also tried copying the files from one location on the drive to another and again the same slow copy happened and each time stalled at around 70MB. Disk Utility said everything is fine. Apple's Hardware Test said everything is fine. So, I booted from one of my cloned drive and I left TechTool Pro running surface scan overnight, and it found no bad blocks. However, console recorded dozens of hard drive errors. I also the 90 minute memory test and the video card test as well and no problems were found. One thing to note is that everthing works fine while booted from the cloned drive. Even file copies on the internal drive complete just fine. I tried copies from the internal to external and internal to internal. No stalls -- it copies as expected. I checked my console this morning and noticed two errors repeatedly showing up with sender as kernel. disk0: I/O error and disk0s3: ioctl(' Does this look like a bad drive or some other hardware problem? I've made an appointment with an Apple Genius to look at it today, but I wonder of he'll be able to help me since all of the tests pass.