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Hardware Thread, external Hard drive which powers only via USB port in Technical; Hi Does anyone know if there are 250gb or above external drives which dont require external power. I conciscious that ...
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    ranj's Avatar
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    external Hard drive which powers only via USB port

    Hi

    Does anyone know if there are 250gb or above external drives which dont require external power. I conciscious that we are running out of power sockets and I would rather get some external drives which power via USB.

    are these available?

    thanks

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    localzuk's Avatar
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    Re: external Hard drive which powers only via USB port

    The largest I can find is a model by 'Formac' which is 160GB http://www.ebuyer.com/UK/product/127831

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    Re: external Hard drive which powers only via USB port

    TBH I don't think your going to find one. The only hard disks capable of being entirely powered by the USB bus is going to be laptop 2.5 inch discs. And they currently stop at about 160Gb

    I have an oldish (40Gb) toshiba laptop hard disk in an enclosure which can be USB powered, however, reading the max power requirements of the disk, it easily exceeds the USB specification. Only some PC's will spin it up, others report a surge and continue if i'm lucky. When its going its ok.

    Firewire is better for this kind of thing, and seems to be quicker too.

    Craig

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    ranj's Avatar
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    Re: external Hard drive which powers only via USB port

    do they do firewire external drives?

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    Re: external Hard drive which powers only via USB port

    Yeah, here's one, although i'm not sure whether its entirely bus powered, it states it has a power supply.

    www.ebuyer.com/UK/product/127831

    Craig

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    Re: external Hard drive which powers only via USB port

    I've an external case with 160 gig 2.5" Fuj drive in and it runs on a usb cable with 2 usb plugs on one end, one for power and the other for data I think. Bought the case from ebuyer and the drive from my normal supplier, it works well and is fast for an external drive.

    BR to all

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    Re: external Hard drive which powers only via USB port

    Just a warning with these. The amount of power supplied is very much dependant upon the machine you are plugging into. I have one of these and it will not work through my USB hub (not host powered) and I get a message popping up saying there has been a surge on the port. It works fine elsewhere though.

    - What a waste of my 100th post.

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    Re: external Hard drive which powers only via USB port

    No posting can be called a waste!

    Congrats on your 100th anyway.

    BR

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    Re: external Hard drive which powers only via USB port

    Also be aware (I doubt it'll catch anyone out at the moment, but it might in future) that Linux obeys the USB specs rigorously. If a device attempts to pull more power than is allowed by the specs, it'll be disabled. This is done for the health of your motherboard/USB hub.

    http://lwn.net/Articles/186331/

    Although the above article deals with Linux. It also specifically mentions mass storage controllers and why trying to 'get away with this' is a bad idea. I suggest everyone reads it.

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    Re: external Hard drive which powers only via USB port

    I'm surprised there aren't any devices that can take advantage of using 2 USB ports. 1 to power and 1 for data transfer.

    Anyone know why this idea shouldn't work? I know it wouldn't be ideal, but I'd settle for it.

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    Re: external Hard drive which powers only via USB port

    You are pulling power from the usb hubs total power output, not the port.

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    Re: external Hard drive which powers only via USB port

    Quote Originally Posted by Skoggmeiger
    I'm surprised there aren't any devices that can take advantage of using 2 USB ports. 1 to power and 1 for data transfer.

    Anyone know why this idea shouldn't work? I know it wouldn't be ideal, but I'd settle for it.
    There are number of devices which do this, Lacie ones and Thecus enclosures for example.

    Quote Originally Posted by ranj
    Does anyone know if there are 250gb or above external drives which dont require external power. I conciscious that we are running out of power sockets and I would rather get some external drives which power via USB.
    Fujitsu recently released a 250gb 2.5inch SATA laptop drive. Bung this into a SATA enclosure and you have a solution. Only problem is that the drive alone will currently set you back over 100 quid.

  13. Thanks to Busybub from:

    Alis_Klar (16th November 2012)



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