I believe this problem is related to Windows (or my fingers), not to anything inherent in the external HD mentioned below. Hopefully, this is the correct group for this question: I have two computers running Windows XP Pro w/SP3, and a Seagate external HD which normally resides on the desktop machine. Beginning a month ago, I needed to work remotely, so I'd copy a couple of data folders from desktop to the external HD, and then plug that into the laptop to transfer the files. This worked for 3 weeks.* But this past weekend, I used the laptop to create a new folder on the external HD, added some files, and when I moved the external HD to the desktop to grab the files, I was greeted with a msg saying "Efoldername is not accessible. Access is denied.". I was curious, so I did the reverse: Working on the desktop, created a new folder on the external HD, added a few files, and then plugged the external HD into the laptop. Same problem. Any clues would be appreciated. I *think* I found one at the Microsoft web site, but I'm not sure. It suggests that I turn OFF simple file sharing on the desktop and take ownership of the stubborn folder. There are two reasons I haven't tried this yet: First, downtime on the desktop is not an option - it's used for work, and I don't know the other ramifications of disabling simple file sharing. Second, simple file sharing is already OFF at the laptop, and it's having the same problem with folders created by the desktop. So, why would it help on the desktop? Help! * The laptop was nowhere near the desktop machine, or I would've networked the two rather than use the external HD as the intermediary. They've since been networked (through my Linksys router), but that won't always be the case, so I need to solve this problem.