I am currently doing a QUICK FORMAT on 1 TB My book for Mac so i can use it on my Windows. However it is taking ridiculously long and so far its 25% with 3 hours. This is brand new, just out of the box. First time using it. My CPU is working at around 75% and I am not sure if i am doing it correctly.
MAKE SURE YOU CHOSE THE QUICK FORMATTER FOR WINDOWS
http://wdc.custhelp.com/app/answers/detail/a_id/3865/kw/FORMAT
