said by Mike Wolf:
I was told somewhere on the Comcast forums it was a Seagate ST1000VM002 1TB hard drive because of the lack of eSATA external drive support right now.
At the end of a status page for external hard drive support for Motorola DVRs (»media2.comcast.net/anon. ··· 9-13.pdf
) it also says:
This feature is currently only available on the DVRs listed on the website and is not currently compatible with DVRs on the XFINITY TV X1 platform; that DVR includes a 1TB internal hard drive.