Let me butt in and point out that the original post says "When i try to initialize it, it says Media is write protected. " So instructions on normal use of Disk Manager will lead to the same message. Qn is how to either convince Windoze to init it anyway, or remove the write lock. Let's hope that Acer's approach works.
I know this is an old thread, but I think this is a common issue. One item of note with WD external hard drives is the special software on them. The software can put a "password" on them them which makes them unable to be changed by diskpart or disk manager. One needs to install the WD Smartware software in order to remove the password and reinitialize the disk.