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I keep both the Lightroom catalog and photo images on an external hard drive, which means I open Lightroom catalog directly from the external hard drive. I find it very convenient when I bounce betwwen my iMac and Macbook Pro whenever I need by plugging in the hard drive. However I noticed my Macbook Pro seems slowing down quite a bit lately when I work in Lightroom and I found out the cause was the speed of my external hard drive (Seagate). After some research, I purchased a 4TB Sandisk SSD to replace the Seagate hard drive. I thought I could copy the Seagate hard drive to Sandisk SSD, but then Lightroom did not recognize the new hard drive. So my second attempt was moving all the folders to the new hard drive inside Lightroom. But this only dealt with the folders not the catalog which also needed to be moved. Since Lightroom only allows one catalog be open at a time, how do I migrate both the catalog and the folders to the new hard drive at the same time?
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In your operating system, you move catalog and folders to the new external disk. Then unplug the old external HD
Then you open the LrC catalog from the new hard drive by double-clicking on it and re-connect all the folders (see Figure 4 and associated text here)
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If you rename the new disk so it has the same name the old disk had, then you will not even have to 'reconnect' anything.