Just thought I'd provide a long overdue update on the performance of this 2nd internal drive hack done last year.
It's been 13 months, and the dual internal drive setup in the HD S3 is still running like a champ. I've only just now started to saturate the 2TB of storage (138 episodes of Star Trek TNG will help do that
), but no issues.
The drive noise is quiet, only noticeable if I'm sitting next to it, and there have been no heat problems, even in my non-air-conditioned house this summer. (We had a few days over 100.)
Because I mounted the supplementary drive internally, redirecting the connector for the external SATA to an internal connector, and splitting the power with a pigtail, I have no problems of the secondary drive getting unmarried through not being being powered up when the main unit fires up.
And the load of the extra drive on the PS has been a non-issue. Because I used the Eco-Green, that might help, but I think I can safely say this is a very reliable upgrade.
Now when I get my 80 year-old mother a Premiere, I can try the experiment again on new hardware.
Thanks again to everyone on this board who provided confidence/support/inspiration to bump my Tivo above the 2 TB internal mark.