Can no longer write to my external HD

Hi
I have had a WD My Book Studio 2Tb external drive connected to my iMac for some time now. Just this morning once booted up I got a popop to say that I could no longer write to the volume, only read and copy from there.
I looked the permissions in 'Get info' and saw 'You can only read'.
I went into disk utility and ran a verify.
The verify suggested a repair, which did not seem to complete. It told me to save off the files and reformat the disk (I haven't done anything further yet)
FYI Get Info shows the disk is Mac OS Extended format.
Is the disk really fried or could this simply be a permissions issue? I am lost, and any help is greatly appreciated

WD drives are problem EHD's with OS X, I would recommend using a new cable to connect and then re-try. However first try doing a couple of SMC resets and see if it can be seen. If you continue to have problems replace it, I'd suggest a higher quality EHD something like a OWC (www.macsales.com) Mercury Elite Pro.

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BobMeister wrote:
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