Time machine not recognising external disk on airport extreme

Hi
I have connected a LaCie d2 Quadra disk to the usb port on my airport extreme.
The disk is formatted as HFS+
If I look in Finder (with Bonjour computers enabled as displayed) I can see the external disk through the airport extreme. I can enter the disk and see the drive (it is connected), but I cannot add files to the disk.
If I open Time Machine setup, I cannot see any external disk at all.
If I look in Airport utility, I can see the d2 Quadra listed as an external disk on the extreme, and I have set it up for File Sharing (using the device password)
Can anyone advise why Time Machine (OS-X Yosemite 10.10.1 on iMac) cannot see it?
And what to do to get it connected please to allow backups from any mac user's machine?
Thanks
Andy

So, LaCie advised to connect direct to Mac to check all ok. It was.
As soon as the HD was plugged in directly, TM recognised it and asked if I want to use it for backup. In Finder, the d2 Quadra appears, I can open it, and transfer files directly to and from it.
For reference, the Airport Extreme is connected via Ethernet to the iMac I am using (so no WiFi in this particular chain of connectivity), and the Extreme firmware is the latest (7.6.4) for the model (802.11n)
The issue is that connecting to the USB port on the Extreme, I cannot get the HD to operate like this!
LaCie now state that they cannot help further!!!
Does anyone have any idea why the Extreme is not sharing the HD as it is meant to?
Thanks
Andy

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gr3len wrote:
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Time machine not recognising external disk on airport extreme

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