Prepare SD card for removal from Cyanogenmod 13 HTC Desire HD A9191

I installed CM on the above phone. I wanted to remove the SD card, but when it boots up again the phone says 'Encryption unsuccessful'. It works again if I put the card back in and reboot the phone. I want to move the SD card to another phone, and have this one without an SD card. I know that it works without an SDcard, but how? Do I need to move the /data partition somehow? How do I do that? Edit: It was the CM build I used, which was aceopt. The *opt* part means that it uses the SD card as internal storage. So I need another build if I want to take the card out. Unfortunately, there doesn't seem to be a non *opt* version of CM 13 for this device, so I'll have to go with 12.