2TB Internal drive and case for a HR20-700?
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there is no such thing as a 2TB internal drive yet. The largest shipping single drive is currently 1tb. A 2 tb external drive is 2 or more drives that the external enclosure is making act like a single one. If you did replace the internal drive, which is breaking the terms of your lease BTW, there would be no reason to put the old drive in a case and hook it up externally. The DVR only uses the internal HD or the external Esata drive and can't use both at the same time. Best solution is to just get a 2 tb external enclosure and hook it up with Esta if you want that much storage.
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So why would his chances of failure go through the roof??? Just a slight exaggeration I think. The chance any drive fails is not directly related to size otherwise we'd see more failures today with larger drives than we did with 40 mb drives which is not the case.t_h said:
Maybe not through the roof, but anytime you start striping data across multiple drives without any sort of parity, your chances of total data loss increases. Assuming the same MBTF on both drives, I think that striping across two drives would increase your risk to double what it would be if only using one drive. If either drive fails, all the data is lost.Duffinator said:
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Seagate 1.5TB drives have been announced, shipping... (sorry) soon. 
(August is one report, no word on price.)
The HR21 family can handle drive arrays larger than 2TB, btw.
Cheers,
Tom
(August is one report, no word on price.)The HR21 family can handle drive arrays larger than 2TB, btw.
Cheers,
Tom
Easy. Most drives that tend to fail tend to fail early (less than a year) but its not a huge percentage that fail early. You buy 5 drives, one fails in three months, the other 4 run for four to five years so the perceived failure rate is low. You bond two drives together, if either one is the flake you still experience a data loss, even though the second drive may have run on its own for the full 5 years.Duffinator said:
So you're dragging a perfectly good drives failure rate down to the level of the low common denominator, which is the odds of the single drive failure plus the potential of the far more complex striping enclosure introducing a problem. Cheap striping enclosures introduce a LOT of problems.
Since as consumers we likely dont have 20-30 drives in operation, just a few (couple in the dvr, one or two in the computer), the failure rate isnt simply half the mtbf of the average drive.
Given the complete lack of any ability to back up the data in question, short of having a second mirroring DVR, the loss is total.
So before I'd go with a striped 2TB setup using a pair of $180 1TB drives in an enclosure far more expensive than a pair of simple esata non striping external enclosures, I'd use a second DVR, mirror important programming, pay the $5 a month fee for the second dvr, and double my mtbf along with my recording options.
If any of this seems obtuse, be advised that I've been watching my 3 year old since 5am.
Perhaps a better analogy would be to consider tires on your car. One goes flat, the whole car is inoperative despite the three perfectly good tires and the failure of the tire could result in a total loss of the car. Given two motorcycles, a tire failure doesnt turn a 25% loss into a total failure, just a 50% one and its never a total loss.
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