My hard drive is: mac OS extended (journaled) format with 2tb. Ever since about a month ago, my HD will only connect to my laptop, no other Mac Os computers, desktop or laptop. I don't remember changing any settings or using any programs to encrypt or otherwise restrict access to the HD.
I used Disk Utility on my laptop to verify the disk and it checks out ok. When I connect it to another computer, it doesn't come up on the desktop, in finder, or in the disk utility.