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Le mardi 18 avril 2006 à 11:47 +0200, Petr Kocmid a écrit : |
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> On Tuesday 18 April 2006 10:14, Frédéric 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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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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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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"never give up" is actually your motto ! |
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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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> 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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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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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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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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Fred |
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-- |
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