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Rockbox mail archiveSubject: Re: Archos Jukebox design flawRe: 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 .... Andrew Jamieson ----- Original Message ----- From: <for_spam_at_gmx.de> To: <rockbox_at_cool.haxx.se> Sent: Wednesday, January 08, 2003 11:23 AM Subject: Archos Jukebox design flaw > Hello, > bought this really nice piece of hardware today at a local computerstore for > > about 37?: > http://rockbox.my-vserver.de/pics/usb20_hdd.jpg > > 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 > "original" > 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 - just > plugged > in the usb. And then - surprise - it worket just via usb ! no wonder - usb > 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 > moving > between work and home i always have to carry 2nd device with me - the archos > > power supply. grrrrrr..... (ok, now with the new device, i have an option > to choose..) > > regards > Roland > > > -- > +++ GMX - Mail, Messaging & more http://www.gmx.net +++ > NEU: Mit GMX ins Internet. Rund um die Uhr für 1 ct/ Min. surfen! > Received on 2003-01-08 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |