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.
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