Sweatice wrote:

>
> "Rock" wrote:
>
>
>>Sweatice wrote:
>>
>>
>>>Anna, your post intrigued me. I searched this discussion group looking for
>>>clues as to why a 40 GB Western Digital USB drive sometimes isn't getting a
>>>drive letter but is getting connected (it can safe-removee; it is found to
>>>be "working properly" by device manager).
>>>
>>>That problem remains unsolved, but your allusion to general unpredictability
>>>of USB 2.0 in a Windows environment matches somewhat my limited experience:
>>>USB drives sometimes showing a drive letter, sometimes not; a cable-powered
>>>USB 2.0 hub used to connect two printers causing the printers to work
>>>intermitently.
>>>
>>>I'd be interested to know if anyone can confirm the general compatibility
>>>problems suspected by Anna or, better, shed some light on the causes of the
>>>types of USB 2.0 problems that she mentions.
>>>
>>>Thanks!
>>
>>Hubs have been known to cause problems, particularly if they are not
>>self powered, but even if they are.
>>
>>--
>>Rock
>>MS MVP Windows - Shell/User
>>
>>
>
>
> Thanks, Rock, for the info that hubs can be a problem in their own right. Do
> you know if the problem is with the USB 2.0 specification, or is it because
> some hubs do not comply with the specification?
>
> (I guess it could also be that the software--Windows XP in this
> case--doesn't handle handle hubs correctly in all circumstances. Based on
> what device manager shows under USB, hubs are a kind of object that XP
> recognizes. and perhaps, then, also must manage.)
>
> Sweatice

Sorry I don't know why.

--
Rock
MS MVP Windows - Shell/User