Computer MBA 13" (4 GB RAM & 1.86 processor) OS X Lion 10.7.2 Hard Drive WD My Passport 500 GB NTFS Formatted Everything has been working fine with this hard drive for several weeks. Last night Adobe Lightroom 3 froze while closing and I had to force quit. Lightroom is reading both the catalog and images from the external HD. Since then when I put the HD in it shows up in the Finder but no folders appear. The finder CPU usage ramps up and makes the laptop almost unusable. I've literally spent the majority of an entire day researching and trying different things with no luck. I've tried: Disk Utility - no luck as it can't unmount the drive Confirmed HD is still working by using on another PC laptop Confirmed MBA still works by accessing a separate WD External HD Relaunching finder both with and without HD connected Looked for anything weird in Activity Monitor (not seeing anything) lsof /volumes to look for open files Downloaded xFile and was able to access the files within the HD (albeit the computer was horribly slow) Can only eject the disk by choosing the "Force Eject" option and then waiting a couple minutes for it to work One weird thing I noticed is that when trying to launch Lightroom again I had the option to load with the same catalog (file) previously used on the external HD and I got an error message that it was already open. However, nothing else was open and Activity Monitor isn't showing any Lightroom activity. This was leading me to believe that the Finder (or laptop) was trying to access a LR catalog file perhaps? Note that this is my first Apple product and I'm not exactly tech-savvy but can follow directions well and try to figure things out on my own. Any help would be MOST appreciated as the only other thing I can think of is a clean Lion install (problem since I've already upgraded and didn't save the installer file). I also clicked on "Inspect" in Activity Monitor for the Finder. Then ran a sample and have attached the output as a text file since it looked kind of long to place in the actual post. Thanks!