Let's build a thread here in the forums where users can post which external eSATA hard drives they're successfully using with Time Warner Cable's Scientific Atlanta 8300HDC HD-DVRs here in Wisconsin.
I've heard that Western Digital's "My DVR Expander" (the eSATA model, 500GB) has been tested and works with the 8300s. Prices seem to start at $130 for these.
We've also heard that the Fantom G-Force GF1000EU Hard Drive (both eSATA and USB 2.0 interfaces, 1 TB in size) works with the 8300s here in Northeast Wisconsin. Prices for this Fantom drive are as low as $89 if you get it on a rebate deal.
Back in June, FTV reader wihogfan told us that the Apricorn ADVRX-500 500GB eSATA drive also works. He purchased his then for $140 at Newegg, but it appears they no longer stock this model.
Which one are you using?