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need help hooking external hard drive to HR24-500

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by hclarkjr, Feb 18, 2012.

  1. Bartman94

    Bartman94 Legend

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    The benchmark hard drive for DVR applications is the WD20EURS. It's specifically designed for 24/7 DVR applications and the WD10EURS (which is the exact same model only it's the 1TB version) is the drive that comes pre-installed from the factory in the HR34. Next to the WD20EURS is the WD20EARX which is identical with the exception of the transfer speed being 6gb/s on the EARX (the EURS is 3gb/s). No DVR is capable of faster than a 1.5gb/s transfer speed anyway, so it's irrelevant.

    The cache size does make a slight difference in pulling recordings from the memory, but that's it. The Green drives like the EARX have a 64MB cache anyway, so getting the Black model is meaningless where the cache is concerned.

    A 7200rpm rotational speed is complete overkill for a DVR application. Even 5400rpm is way more than what's needed for DVR applications. The Black Caviar drives are identical to the recommended Green ones with the exception of the rotational speed and the additional CPU. The increased 7200rpm rotational speed however runs several degrees warmer and is also nosier which makes the Black models a DISADVANTAGE in a DVR application.

    The second CPU in the Black models provides no advantage in a DVR application and does nothing to improve performance. You have to remember... we're not doing tons of power computing here guys, we're just watching television. So stop wasting time putting a 500 horse power engine in a Kia... it's still just going to be a Kia.
     
  2. Rich

    Rich DBSTalk Club DBSTalk Club

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    So, I should see faster downloads with a 64 cache? I don't think I do. We're discussing this in another thread now. I'll send you a link to that.

    Rich
     
  3. Rich

    Rich DBSTalk Club DBSTalk Club

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    Excellent post! Thanx.

    Rich
     
  4. CCarncross

    CCarncross Hall Of Fame

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    Jackson

    If by faster downloads you are referring to VOD, the cache size on the drive will have nothing to do with VOD speeds, thats all about ISP speeds, ISP throttling, and/or possibly throttling on D*'s end....
     
  5. Rich

    Rich DBSTalk Club DBSTalk Club

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    Here's that link, again. Don't think I sent the last one.

    Rich
     
  6. Rich

    Rich DBSTalk Club DBSTalk Club

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    Yeah, that's what I meant. I'm beginning to get fuddled...again.

    Join us on this link if you want to, I can use all the help I can get.

    Rich
     
  7. CCarncross

    CCarncross Hall Of Fame

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    Not a chance..way too many whining idiots posting in that thread...:lol:

    There's a couple guys posting in that thread that I can't stand to read their constant BS and complaints..yet they stay with Directv, makes absolutely no sense.
     
  8. Rich

    Rich DBSTalk Club DBSTalk Club

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    Geez, don't hold anything back....:lol:

    Rich
     
  9. trstew

    trstew Cool Member

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    Feb 21, 2012
    I'm having the same problem as hclarkjr with my HR24, Thermaltake Max 5, and WD20EARX setup. My drive's been formatted and partitioned - if I ever get the HR24 to read it, will it reformat the drive automatically or does it need to be wiped clean? Also, is there some way to determine if the HR24 is reading my encl. allright?
    Thanks for any advice you can provide...
     
  10. Rich

    Rich DBSTalk Club DBSTalk Club

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    I just read the whole thread and I don't see any problems hclarkjr is having, could you clarify?

    Do this: Unplug both the 24 and the TT dock, leaving the eSATA jumper in place between the two. With the HDD in the dock and seated properly (sometimes you have to give them an extra shove to get the HDD to fit into it's slot in the TT), plug in the TT and put your hand on top of the HDD. You'll feel it spin up and "chug" just a bit after it gets done spinning up. Doesn't take long. Then plug in the HR and as it boots up you should see the Blue light on the TT start to click red or pink on one side (the older TTs had a more pinkish light than the new ones do) and that will mean the HR has recognized the TT's HDD.

    What I haven't seen is which 24 you have. If it's a 24-500 you might have some problems with the external drive. If you do PM me.

    Rich
     
  11. trstew

    trstew Cool Member

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    Feb 21, 2012
    Yippee i a - it worked! Thanks!!!

    P.S. Is there any way to determine how much disk space you have besides guesstimating from the "% left" bar on the playlist?
     
  12. TomCat

    TomCat Broadcast Engineer

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    I think you kind of nailed it.
     
  13. TomCat

    TomCat Broadcast Engineer

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    A 32 MB cache could hold about 34 seconds of MPEG-4 video. A 64 MB cache could hold about 68 seconds of video. A HDD in a HR2x has to read and write up to two streams each constantly, so the 64 MB cache can be up to about 16 seconds behind inside the cache buffer, input to output, and the 32 MB cache can be up to about 8 seconds behind. Obviously there are other tasks going on at the same time, but those are minimal. Also, the chunking size is a factor; video is written and read (and HDD space for writing is allocated on the fly) in chunks of only 3 or 4 seconds.

    All of this means there really doesn't need to be much cache available in the first place, as the throughput tasks are not all that intensive for a DVR, so it would seem to follow that a 64 MB cache is probably overkill. A modern HDD can handle up to 12 compressed HD streams at once, and even the DISH Hopper only approaches a throughput level of about half that.

    Regardless of what the "activity" light is telling you, there is just as much HDD read/write activity in a 32 as in a 64 if both are reading and writing the same amount of data to do identical tasks; its just that the 64 can buffer the data twice as long if it should need to, which it really doesn't. I think the "activity" light is keyed more to actuator arm movement than anything else; if it were keyed to R/W activity it would be lit solid all the time, pretty much.

    About the only thing different between the 32 and the 64 is that since the actuator arm might be required to jump around the drive a little more on the 32 once the number of threads and amount of R/W reaches a certain level, a job the actuator arm was built to do tirelessly, the bearing in the actuator arm in a 32 might wear out before the bearing in a 64, but drives usually fail in other ways long before that could happen anyway.
     
  14. Rich

    Rich DBSTalk Club DBSTalk Club

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    You're welcome.

    No, but you'll get used to using the Available bar. That's a feature I don't believe I've ever read a complaint about. Just a quick glance will tell you all you need to know.

    Rich
     
  15. Rich

    Rich DBSTalk Club DBSTalk Club

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    Huh. Two good posts about caches in one thread. Know more about a cache than I ever did.

    Rich
     
  16. hclarkjr

    hclarkjr Cool Member

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    Feb 18, 2012
    drive finally arrived today, had bit of trouble installing it though. seems the only way my HR-24 will see an external is to hit the red reset button. i tried the other conventional ways listed and had no success. [​IMG]
     

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