How to format an hard drive of client from window server 2008

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I have :

- 1 window server 2008 (domain) (c:\ , e:\)
- 3 client window 7 (had join to domain)
(I'm named client01, (c:\, e:\)
client02, (c:\, e:\)
client03 (c:\, e:\))
from server i'm typing : format e: /q -> formated hard drive E of server
format \\client01\e$ /q -> error : Invalid drive specific!

i want to format disk e of client01 from server so what should i do?? anybody can help me?? Please!!!