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difference between 2 WD eSTATA drives: My Book AV vs My DVR Expander

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by Decolliber, Sep 22, 2010.

  1. Decolliber

    Decolliber New Member

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    Sep 21, 2010
    I have a WD 1TB eSATA drive (My DVR Expander WDG1S10000) connected to an HR21 and it has worked fine for over a year, except for slowing down a lot as the drive fills up.
    I just acquired an HR24, and when I checked WD web page, they now have a new drive called My Book AV (WDBABT10010HBK), which they claim is HR 20-23 compatible (and I assume HR24). The WD web site gives no technical info about how they differ, other than that the newer My Book has a USB port (that I do not need), and "Silkstream technology" (=???) for "smoother" recording and playback, but I have no idea whether that has any significance for DTV customers.

    Since I know that the older My DVR works with HR2*, that would be the safe choice, but I am wondering if the newer My Book has some technical improvements (eg, does the HD spin at a faster speed, say 10k rpm instead of 7200rpm?).

    Does anyone know if these two models differ, beyond the USB port and "Silkstream"?

    Has anyone tried the newer My Book on an HR24?

    ps. Just noticed an Amazon customer review of the My Book AV:
    "...I got approximately 60-68MB/Sec with ESATA and 27MB/Sec with USB2. It initially starts out at approximately 100+Mb/Sec ESATA and very rapidly drops to 60-68. I spoke to WD about the speed drop and they said that was normal. ..." (this customer had it connected to a "new" Toshiba laptop, not a DVR).
    I would have thought that 60-68 mb/s is very slow for a SATA connection.
     
  2. oldbamaguy

    oldbamaguy Legend

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    Jun 1, 2009
    For the record, the Western Digital WD20EADS and WD20EVDS seem to work fine when enclosed in Antec MX-1s. I don't think that I have EVER seen a problem posted here with either of those combinations on any model HD-DVR.
    (I have had four for over a year.)
     
  3. P Smith

    P Smith Mr. FixAnything

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    Jul 25, 2002
    W.Mdtrn Sea
    I would have thought that 60-68 mb/s is very slow for a SATA connection. - that's common mistake: it's MB/s what would roughly equivalent to 600 Mbps, it would be pretty good result if you connect it to 1.5 Gbps [1500 Mbps] host. Remember it is [electro]mechanical device [HDD].
     
  4. TomCat

    TomCat Broadcast Engineer

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    Aug 31, 2002
    +1. They also seem to work well as drop-ins (internals). I would not get caught up in the minutia of these other drives; the ones oldbamaguy lists are tried and true.

    HDD throughput is typically not an issue. Modern drives are pretty fast, even at 7200 RPM (which will generate less heat than 10K). WD claims that their drives can handle 12 HD streams at once (compressed, of course). A HR only accesses 3 at one time at the most (2 records + 1 playback). DoublePlay may take a bit more overhead (which is possibly why we are given the option to turn it off).

    HDDs should not "slow down" as the drive fills. I have had HR drives full with no slow down. DVRs do not fragment their HDDs, and there is nothing "in play" regarding recording space you are not accessing that is empty that is different in any way to when that space is occupied. All the system knows is the sector it is reading at the time, and there is nothing different about R/W when space is nearly full on a DVR (not so on your PC). The level of background tasks may increase if you have a lot of SLs, however (which may explain the limit of 50).
     
  5. fullcourt81

    fullcourt81 Legend

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    Sep 8, 2005
    Amazon has the WD20EARS, which has a 64MB cache instead of the EADS 32 MB, for less than the EADS. both are Caviar Green and identical specs
    any reason to get the EADS? EARS is $20 less with free shipping
     
  6. P Smith

    P Smith Mr. FixAnything

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    W.Mdtrn Sea
    Just search for "EARS" here and you'll know why it's NOT recommended.
     
  7. fullcourt81

    fullcourt81 Legend

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    Sep 8, 2005
    Well I found this post, it is pretty easy to understand. Thanks for the tip!
    EADS for me.


    I keep doing this, but I guess it's time again:

    The WD EARS HDDs do not work with the HRs.

    So far, I've seen one post about a member having an EARS work. One.

    Rich
     
  8. TomCat

    TomCat Broadcast Engineer

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    Aug 31, 2002
    Folks report good luck with the EVDS also, which is built specifically for DVR (multimedia) use.

    Specwise, the EARS seems like a good candidate. Turns out, it just isn't.
     
  9. RonH

    RonH Godfather

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    Jul 25, 2007
    Thanks for the info on these 2 Hard drives. Do both of them work with the Thermaltake BlacX ST0005U connected to DirecTv DVRs?

    Thanks
     

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