Hi all. I have an external 2TB Western Digital Caviar drive hooked up to my 2006 iMac through a docking bay and USB 2.0. I'm running 10.6.6 and the drive is formatted as Mac OS Extended. It's my media and backup drive and I'm always copying stuff to and from it. All was well and good with the setup and I had no problems for probably 5 or 6 months. Just around Christmas, though, I started getting alerts when trying to copy files over to the drive. Error Code: -50. Basically, I can still view/read files on the drive and play songs in iTunes, but if I try to rip a CD, iTunes hangs and dies. If I try to copy any file over using the Finder or empty the trash with files from that drive, I get the -50 code and alert. A restart will fix the problem for a little while but then it's back after maybe 30 minutes or so that's obviously not a good long-term solution. This page claims it is an "Error in user parameter list" but I have no idea what that means. I've done a bunch of Googling, but people are saying it's anything from problems with networked NTFS drives (which it's not for me) or that it's a disk permissions issue (no bootable system on the drive). Has anyone else experienced this code and found a solution to permanently get rid of the problem? Thanks for any tip.