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Subject: Re: V1R running on USB power possible.
From: Vladimir Pantelic (pan_at_nt.tu-darmstadt.de)
Date: 2004-09-02


Stuart Tedford wrote:
> I'm getting annoyed with only being able to connect my V1Recorder to my PC
> via USB for an hour or so before the batteries go flat. It just doesn't
> give me enough time to do the things I want to, even on USB2. (eg,
> defragment, copy loads of files, etc). I have an 80G disk in it.
>
> So I'm thinking, why can't I connect the USB 5v to the disk via a diode or
> something. If I use a shotky diode I could deliver about 4.7 volts to the
> disk. I guess the main problem is the batteries which are also connected
> directly to the disk. So maybe 4.7 volts via a diode and totally dead
> batteries would be a problem, but one I could try to avoid by being aware of
> it.
>
> Has anyone else tried doing this, or thought about it?

You have to make sure that you draw a maximum of 500mA on the USB 5V,
if you draw more you could damage the USB port on your PC, or the USB
host PC (or hub) might decide to shut this port down to prevent damage.

So, it's not just a simple diode.

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