What is the file format of wd book live?

just wanted to check what format wd book live uses. i understand that it can be simantanelouly used for both windos and mac and believe only FAT32 can do it and thisn apple time machine wont work 

Also is it possible to partion the 2 tb disk equally and use it as a raid 1

It uses the EXT4 file system.

Despite you won’t be able to create the desired partions, a RAID1 on a single disk doesn’t make sense.