Rockbox mail archiveSubject: Re: Archos Jukebox design flaw
Re: Archos Jukebox design flaw
From: Andrew Jamieson <andrew.jamieson_at_projectlab.net>
Date: Wed, 8 Jan 2003 11:49:46 +1100
If your USB port strictly follows the spec, it is not possible to power a
standard HDD, as 500mA just doesnt cut it (these drives draw ~ 1A when
spinning up). However, many USB implementations have no, or very
rudimentary, current limiting (such as a PTC fuse). With such ports, you
can continue to draw power past the spec limit, all the way up to a level at
which either the PTC fuse trips (probably a bit over 1A, depending on the
type), or your port power supply has a cow.
So, this is one case where the Archos engineers did the right thing ....
----- Original Message -----
Sent: Wednesday, January 08, 2003 11:23 AM
Subject: Archos Jukebox design flaw
> bought this really nice piece of hardware today at a local computerstore
> about 37?:
> It is external usb 2.0 2.5" hdd case.
> I did a hdd upgrade for my juke some days ago and had no usage for the
> archos hdd - so i decided to use it as additional portable storage.
> This device has additional power adapter, but i forgot to plug it in -
> in the usb. And then - surprise - it worket just via usb ! no wonder -
> specs say,
> that you can get 500mA from usb ports.
> This device has same Chipset (ISD300) as archos JB Recorder.
> I`m really angry, that archos development did ignore usb power !!! When
> between work and home i always have to carry 2nd device with me - the
> power supply. grrrrrr..... (ok, now with the new device, i have an
> to choose..)
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Received on 2003-01-08