Did you purchase a usb to sata adapter for 2.5 inch ssd drives? I used a clone software to clone the system drive to the new ssd. After that is done then l replaced the system drive with the new ssd. If you have a 3.5 inch hard drive, there isn't enough power from the usb port to the 3.5 inch drive so you have to purchase a usb to dock device for 3.5 inch drives and it has a separate power cord to power the hard drive adapter case. Is your computer desktop or laptop?
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