As others have said, the SATA cable is stuck to the drive with a spot of something sticky. I used a long thin flat metal prying/opening tool (often found in mobile cell phone opening kits), and inserted this between the cable and the PBC, and gentle wiggled it while gently pushing it through. This separated the cable from the drive quite easily. After I attached the cable to the new drive, that spot was still a bit sticky, and was good to stick onto the new drive as well!
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