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.