Stefan Richter wrote: > Matthias Schniedermeyer wrote: > >>Robert Hancock wrote: >> >>>Matthias Schniedermeyer wrote: >>> >>>>I have a 1,5 Meter and a 4,5 Meter cable connected to the USB-Controller >>>>and i only use of them depending on where the HDD is placed in my room, >>>>the other one is dangling unconnected. >>>> >>>>Then i will unconnect the short cable and use the long cable exclusivly >>>>and see if it gets better(tm). > > BTW, I suspect front panel connectors could introduce noise too, via the > jumper cables from motherboard to the panel.
It's a 5 port PCI-Addon-Card, no front panel connectors. (The computers has only an OHCI/USB 1.1 controller onboard, which i use for keyboard & mouse) >>>That long cable could be part of the problem - I don't think the USB >>>specification allows for cables that long (something like a 6 foot max >>>as I recall). >> >>http://en.wikipedia.org/wiki/USB2 >> >>Says that 5 meters are allowed. > > > I don't know about USB 2.0, but in case of FireWire, ~4.5m long cables > are theoretically in spec too. I've got a FireWire 400 and a FireWire > 800 cable this long, and both don't work very unreliable. Depending on > what's connected, they fail sooner or later. However due to how FireWire > works, this is immediately noticed as data CRC errors or bus resets. > I.e. it's nearly impossible for noisy hardware to _silently_ cause data > corruption. I would suppose USB has similar CRC checks. > > Also, you mentioned that the corruption occurs systematically on certain > byte patterns. Therefore it's certainly not related to the cables. It'd guess that too, but who can that say for sure. :-| Bis denn -- Real Programmers consider "what you see is what you get" to be just as bad a concept in Text Editors as it is in women. No, the Real Programmer wants a "you asked for it, you got it" text editor -- complicated, cryptic, powerful, unforgiving, dangerous. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
