Connect My Book 3T to My Time Capsule

I Have TimeCapsule , when i Connect My Book to Time Capsule, why I can not see My Book in Time Capsule.

anyone can Help me, how should i do ???

Welcome to the Community.

You may have to reformat the hard drive to begin with as most WD My Book drives come Windows-ready:

http://wdc.custhelp.com/app/answers/detail/a_id/3865/

However, please bear in WD does not support using WD USB drives on non-WD routers. As such they are not tested for compatibility. If you need a wireless backup solution I would recommend a WD My Book Live or a WD My Cloud instead.

Regards,