Just wanted add another enclosure to the list:
Ampaqs Xtrastor Dual 3.5in SATA to eSATA + USB 2.0 HDD External Enclosure XS-2B35U-R-BK, Raid 0 + Raid 1
Available in Black & Silver (got black to match TV & HR21-100). It has a very quiet fan and all aluminum enclosure for best heat dissipation. I recommend disconnecting the light cables from the board as the lights are pretty bright, but currently are giving me peace of mind knowing that it's working. It comes with it's on eSATA cable which is working great. This drive has both RAID 0 & RAID 1 for those not sure what they want (more space vs. backup)
I stuffed 2x 1TB Western Digital WD10EACS with default jumper settings (aka: none) and flipped the switch to RAID 0, then hit the reset switch and turned it on before turning on the DVR. Worked like champ. If the TV is quiet (aka Paused) you can only hear the faint sound of the Hard Drive writing, but it's super quiet. The case doesn't get hot either, just warm as is expected.
Enclosure XS-2B35U-R-BK: $59
Drives WD10EACS: $159 x 2 = $318
Total: $377 for 2TB of HD Recording goodness.
Search the web for these part #s as each day they get cheaper and available from different places. Got the enclosure @ directron.com & HDs @ NewEgg.
Thx for all your help!
Who has only 1 month left of free HBO/Showtime and after recording 25 HD movies still has 90% free space left.