Need help formatting partitions 3 and 4

Finally installed the CFFA, and the speed and silent operation are great!
I'm not clear on how to format partitions 3 and 4, though. After reading the other posts, I've put the card into slot 5 of my ROM 1 GS and used the control panel to set slot 5 to "Your Card." But when I try to format slot 6, drive 1 or 2 (which is where I *think* partitions 3 and 4 will appear) I get a "write protect" error.
I'm running Prodos 8 2.03, System Utilities 3.1 with slot 6 also set to "Your Card," and using a 256 MB SanDisk CF.
Any advice as to what I'm doing wrong?
Thanks,
Dave
I'm not clear on how to format partitions 3 and 4, though. After reading the other posts, I've put the card into slot 5 of my ROM 1 GS and used the control panel to set slot 5 to "Your Card." But when I try to format slot 6, drive 1 or 2 (which is where I *think* partitions 3 and 4 will appear) I get a "write protect" error.
I'm running Prodos 8 2.03, System Utilities 3.1 with slot 6 also set to "Your Card," and using a 256 MB SanDisk CF.
Any advice as to what I'm doing wrong?
Thanks,
Dave