Time Machine sees my drive but will not use it.

I am running mountain lion on my MacBook Pro. I have an external WD DD that has 1TB partioned for mac and 1TB for PC. When I hook the DD directly to the mac via USB TIme machine uses it no problem for backing up. But moving forward I want to have the backup DD on my wireless network. When I then disconnect it from the mac and instead connect it to my wireless rounter (again with USB) Time Machine is not happy.
Time Machine find the drive and recognizes it that is has Mac backups on it, but it will not let me "choose disk" to use it forback ups going forward.
Anyone know how I can fix this??
I orginally formated the the backup drive with an iOS older than mountain lion..
I have done some searches in the support communities and don't see this exact issue listed.

No, pondini has enough to keep himself occupied with apple routers.. getting TM to work on non-apple routers maybe simply impossible.
Here is Netgear version.
http://www.netgear.com/assets/landing/readyshare/readyshare-time-machine.pdf
Do not be surprised if you have issues. Many non-apple NAS and routers that supported TM were broken by Lion changes.
\BTW, Netgear does not list the WNDR3700 as compatible with TM.
Supported Router:
Centria WNDR4700/WNDR4720, WNDR4500, WNDR4300,
WNDR3800, WNDRMAC
Supported DSL gateways:DGND4000

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Can someone please respond to this thead? Any seriously in the know peeps?
I have plugged in my new 2TB Time capsule - works great as a router!
Thing is when i actually try and use time machine it cannot find the drive at all?
I have enabled file sharing etc. used tinkertool to discover that my drive is a hidden network drive but i only have read permission and nothing else?
Have i purchased a dud machine?
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Time Machine sees my drive but will not use it.

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