SecureAccess for MAC

I erased the entire SanDisk using MAC computer Disk Utility.

Ok.  A bit overkill IMO.

the entire USB seems to be empty.

Gee, what a surprise.  What did you expect after “I erased the entire SanDisk”??

Do I need the SecureAccess v2.0 for Mac?

For iTunes probably not.

do I need to partition my SanDisk Cruzer Glide?

I think you need to find an Apple store to help you.