On Sun, 4 Sep 2005 14:04:46 -0700, Matthew Dharm <[EMAIL PROTECTED]> wrote:
>On Sat, Sep 03, 2005 at 09:53:19PM -0400, Alan Stern wrote: >> On Sat, 3 Sep 2005, Jan De Luyck wrote: >> >> > I've posted in the past about problems with these enclosures - increasing >> > the >> > delay seems to fix it, albeit temporarily. The further you go in using the >> > disk in such an enclosure, the higher the udelay() had to be - atleast >> > that's >> > what I'm seeing here (I've got two of these now :/ ) >> > >> > One permanent fix is adding a powered USB-hub in between the drive >> > enclosures >> > and the computer. Since I've done that, I've no longer seen any of the >> > problems (i've attached the 'fault' log). Weird but true, since the drives >> > come with their own powersupply. >> > >> > Hope this helps anyone in the future running into the same problem. >> >> This one certainly goes into the Bizarro file. >> >> Just out of curiosity -- when you use the powered hub, does the drive work >> even if you remove that delay completely? > >Aren't USB 2.0 hubs more "intelligent" as part of the requirement to >support 1.1 and 2.0 devices? I wonder if it's really a 2.0 drive, and if >the timing is different enough with the hub to make a difference. Fixed a USB powered (two USB plugs) Genesys based 2.5" HDD enclosure with extra 5V supply bypass capacitors, the HDD was shutting down without loss of data with a 'soft' 5V supply. Now USB drive works everywhere except a laptop with a single USB. HDD uses 700mA, USB is spec'd 500mA per socket. Some bugs are the hardware :o) Grant. ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
