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On Tue, Apr 18, 2006 at 10:59:00PM +0800, Fr?d?ric Grosshans wrote: |
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> Le mardi 18 avril 2006 ? 11:47 +0200, Petr Kocmid a ?crit : |
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> > On Tuesday 18 April 2006 10:14, Fr?d?ric Grosshans wrote: |
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> > |
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> > > Any idea left ? |
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> > |
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> > So, you definitely have a hardware problem. Digging for the id of your device |
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> > 1043 8006 reveals a linux kernel mailing list archive thread: |
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> > |
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> > http://www.ussg.iu.edu/hypermail/linux/kernel/0410.0/0023.html |
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> > |
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> > with the identical problem: the device worked in some computer and not in |
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> > other. |
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> |
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> That's a bad news, since the goal of an USB stick ist precisely to move |
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> data from one computer to another. |
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> |
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> <reading the complete thread, at |
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> http://marc.theaimsgroup.com/?t=109656092700004&r=1&w=2 > |
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> |
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> what is strange, is that the 1043:8006 was precisely the identity of |
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> the stick on the working computer. Futhermore, this usb stick has worked |
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> on the same computer. |
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> |
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> > I see two possibilities: a slave controller chip incompatibility or |
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> > insufficient power problem, device wants to sink more current than port |
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> > actually provides at +5V. Port should provide up to 500mA, while many |
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> > notebooks are very weak at usb power and do not keep up the standard. |
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> > |
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> > To eliminate the first one, you should seek for the computer (or maybe an |
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> > external usb hub) which will work with that chip. |
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> |
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> That's currently impractical for me. I may try several computers when |
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> I'm back home. |
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> |
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> > To eliminate the power issue on your equipment, you can try to measure |
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> > consumption at the +5V with some prepared usb cable or even try to feed the |
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> > device from an external power source. You will need laboratory equipment to |
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> > do it (A regulated laboratory power supply with current limitation). Ask some |
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> > electronics engineer. |
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> |
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> "never give up" is actually your motto ! |
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> |
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> I could look for such equipement here (I'm in the physics department of |
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> a Chinese university), but I do not feel like it (I already destroyed to |
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> much electronic equipment during my PhF thesis !) |
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> > |
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> > As a first aid, try an external usb hub with it's own power supply. |
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> I'll try when I'm back home (in may) |
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If you are in Beijing, |
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it is easy to do the test using an external usb hub with it's own power supply for free. Because Beijing has the biggest computer market in north of China! |
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Simply, you go to one of the sereral big computer stores on the |
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Zhong Guan Cun street, the street is near Beijing University, and ask |
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for a free test with the usb hub. If it works, you can buy it with 10 or |
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15 dollars or cheaper! |
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You'd better ask your host to come with you for bargain! |
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|
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By the way, I'm in Beijing now, if you are in Beijing too, you can call me for more help.:-( |
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> |
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> |
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> > 1G flash chips require a lot of power to operate, and not having enough is |
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> > consistent with your symptoms of "no media". |
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> |
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> I didn't know. I naively thought "the bigger / the better" and I don't |
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> really need something so big... |
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> |
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> Could that be that the power consumption of the stick increases with the |
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> volume of the files on it ? Which would explain the correctness of the |
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> first tests (with small files) and the problem when the key holds a |
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> bigger file... |
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> |
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> By the way, if it's a hardware problem, would it be useful to get the |
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> stick replaced by another of the same model ? Or is that a model |
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> problem ? |
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> |
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> |
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> Fred |
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> |
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> |
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> -- |
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> gentoo-user@g.o mailing list |
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|
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-- |
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best wishes |
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David Chen |
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|
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office tel: 010-5888-7111 |
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-- |
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