Thanks for letting us know about this thread. I am with Cox, so it affects me too.
I went ahead and purchased WD10EVDS. I just need some time to image it, swap it with my WD15EARS and fill it up with recordings again. I should report back before the end of the week. We will see how it works with my old Cox firmware/software (we already established that WD10EVDS works).
OK, I am confirming the bad news that my Motorola DVR box with Cox software is NOT utilizing the full hard disk space available. The usage has stabilized now and diagnostic screen on the box shows about 840GB of free space, while DVR content takes about 140GB (the rest is for the system, file system, and DVR index).
Until Cox Communications fix their "Cox customized" DVR software, we do not get to benefit from any hard drive bigger than 160GB.