I'm sorry, that isn't a question we can understand.
What does "Wmayu8789927 " mean? Is it a model number, a serial number, or an error message? What do you mean by disk validity? If it's a good disk to buy, or if your disk is corrupt?
If English is not your primary language, I recommend using Google Translate. Its translations can be a little odd, but we can usually understand the output. Give us more info, and we will help.