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External Hard Drive

Discussion in 'ViP612/622/722/722K DVR Support Forum' started by chris83, Sep 20, 2011.

  1. chris83

    chris83 Legend

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  2. P Smith

    P Smith Mr. FixAnything

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    No.

    Look for that one what has external power supply !
     
  3. chris83

    chris83 Legend

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    Aug 16, 2006
  4. P Smith

    P Smith Mr. FixAnything

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    Too complex for EHD, any cheap USB-SATA enclosures with external power supply will works fine as EHD.
    Check tigerdirect, newegg, frys...
     
  5. thomasjk

    thomasjk Legend

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  6. chris83

    chris83 Legend

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    Aug 16, 2006
    Thank you both very much! Out of curiousiity, why is the external power source the key?
     
  7. P Smith

    P Smith Mr. FixAnything

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    Nobody knows except of that engineer who calculate and limited USB load to the ports of 922.
    No one reveal the max current and official word is "no for USB powered drives".
    One day I would connect my eLoad box to it and will check it.

    By official USB org spec, a powered USB port could provide up to 500 mA after successful enumeration by a host.
     
  8. Grandude

    Grandude RichardParker II

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    I would suspect that the USB ports do not supply enough startup current to get the platters/motor spinning. I don't have the equipment to test/prove this theory but do have some anecdotal evidence.

    I have a bare drive pulled from an old 721 or 921, can't recall which, but I put it in an external enclosure and the power block didn't supply enough current to spin it up. It had the typical DC connector with + and ground.

    I found another enclosure which had four wires, I suspect two for the motor and two for the electronics, and it spins up the drive every time.

    Maybe someone with the proper equipment could prove or disprove this theory once and for all and we then would have the evidence to point to whenever this question comes up again. And I know it will.:grin:
     
  9. TBoneit

    TBoneit Hall Of Fame

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    a. That would be a IDE Desktop type of drive. It draws way more than .5Amp

    B. The USB port only provides 5Volts and that type of drive needs 5 Volts and 12 Volts.
     
  10. Grandude

    Grandude RichardParker II

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    The example I used to press my point about the startup of a motor in a drive was indeed an IDE type drive but it was installed in an enclosure designed to handle that type of drive. My point is still that even in a USB drive, the startup of the motor could be the reason that it would not work without external power when connected to a 622/722 due to a lack of current to get the motor spinning.

    Another anecdote I have is a recent purchase of an external USB DVD drive. It came with a USB cable which had two connectors at the computer/laptop end which would/should imply that a single USB connector might not provide enough current to do the job. The manufacturer decided it would be cheaper to provide the split cable rather than a power block.

    I wish that I had the proper equipment to test my theory, but alas, too late in life to think about adding to all the crap now on my workbench.:grin:
     
  11. Tecmo SB Guy

    Tecmo SB Guy Legend

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    Sep 27, 2007
    Just curious, do you guys turn off your external hard drive when not in use or just leave it on all the time?
     
  12. TulsaOK

    TulsaOK New Member

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    I usually turn off the external drives when I'm not planning on using them. I've had issues with the daily update hanging if the drive is powered on.
     
  13. Tecmo SB Guy

    Tecmo SB Guy Legend

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    Thanks, Kent.

    I just bought an external hard drive today.

    Also what's the best way to move it safely? Like how long should it be off before I attempt to move it to another location?

    I know with the DVR's, I thought I read somewhere you have to unplug it and wait 5 minutes before moving it to another location.
     
  14. TulsaOK

    TulsaOK New Member

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    When I move the EHD between my 612 and 722k I unplug it and move it. I've never had an issue doing that.
     
  15. P Smith

    P Smith Mr. FixAnything

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    You can hear the sound of spinning down drive ... 5-15 seconds.
     
  16. Tecmo SB Guy

    Tecmo SB Guy Legend

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    Do you guys unplug the external hard drive when you don't use it?

    I used the power button to turn it off last night and unplugged it.

    This morning I plugged it back in and it just turned right on without me touching the power button. I was thinking that might not be good for it. That it might be better just to leave it plugged in all the time. Also the DVR was on and recording at the time when I did that. Maybe that's why it turned on without the power button. I don't know.
     
  17. Ray C@DISH Network

    Ray C@DISH Network DISH Representative DISH Representative

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    Tecmo SB Guy,

    I have my EHD plugged in all the time and I haven't had any problems with it. I have a WD 1.5 TB drive. When you plugged the EHD back into the receiver, did a message pop up on the TV stating you have connected an external drive into the USB port? That's all that should happen when you plug it back in. Thanks.
     
  18. Tecmo SB Guy

    Tecmo SB Guy Legend

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    Yeah it said that. Although it did that after the power light on the EHD blinked for a while. Like the EHD needed a while to get booted up and get recognized by the 722K.
     
  19. RASCAL01

    RASCAL01 Godfather

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    I also leave mine on all the time. I just unplug it from the usb port which is need for other items like the ipod:D
     
  20. dishman1999

    dishman1999 Registered User

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    The 4 TB BlackArmor® NAS 220 server from Seagate
     

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