To Instrument or Not Instrument a Second Drive in Linux

This question is related to Symantec Drive Encryption for Linux 10.3.

I've sucessfully encrypted disk 0 containing the /boot partition. Now I need to encrypt a second disk (disk 1) located in the same machine. Does disk 1 (not the boot drive) need to be instrumented prior to encrypting it?

I understand the instrument command overwrites the MBR with PGPMBR but am not sure if it is only meant for the boot drive and not on secondary drive.

Thanks.