Lightroom 4.2: Moving catalog to another hard drive?

My lightroom photos are on a single hard drive. It is full with just over 100,000 photos. I am moving them to a single 3 TB hard drive and am down to the last 2 years od pictures. everything went good till then. year by year I was able to have lightroom move them to the new drive. But then, yesterday, THey began moving only part of a day and bogging down to a standstill. I had to restart the move, and now am trying to move them day by day, but still experiencing times when they move as they should and other times when it takes over 5 minutes to move a single photo. I have an IMAC 27" intel with 8 meg of ram. version 4.2 of Lightroom. Any suggestions appreciated...
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  • Make sure you have them set as a folder hierarchy http://members.lightroomqueen.com/ind... and then move them using Finder. Once they're on the new drive, relink the parent folder with the new location. http://members.lightroomqueen.com/ind...
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  • After a lost day, things are better. There are some photos that simply will not move as part of a group movement. Lightroom takes a long time trying to read the photo and finally skips it. This happened to one folder with 35 photos in it...the computer seemed hung. I stopped the import, and took a different photo and it moved almost instantly. Then took 2 others with the same result. Then three...stuck again. Stopped that import and took a different one and it moved quickly. finally moved them all but the one, and then selected that one alone and it moved. Go figure. It then moved several days of images with no problems, but hung up. Let it run and eventually all but 2 moved. I finally had to delete the 2 photos to move on...now things are moving again. still not sure of what is going on, but it is less critical now.
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