Removing security features from Sandisk flash drive

I have a couple Sandisk “Secure II” 8GB flash drives that have some kind of security feature that hides them from Windows when in normal boot mode. They are fully visible and accessible in safe mode. I’ve tried reformatting them several times but no dice. They appear to be clean in safe mode but they’re still hidden in normal mode.

Any thoughts, tricks or suggestions on how I can completely remove this feature?

If the computer has UEFI you need to disable the Secure Boot option.