OT: Krazy USB Kameras (RE: Programatically finding value of "cygdrive" prefix)
Reid Thompson
reid.thompson@ateb.com
Wed Aug 17 03:05:00 GMT 2005
Gary R. Van Sickle wrote:
>[snip]
>
>
>>NOTE: A digital camera shows up as an USB drive, i.e. a DOS
>>drive -> e.g. /cygdrive/<next free letter> - and is available
>>so long as the camera stays ON (it eventually WILL go OFF
>>after last use, just as your screen blanker! Depending on how
>>you've set it or use it.)
>>
>>
>>
>
>A USB Mass Storage Device that does this is poorly designed at best, and
>probably not compliant with the USB specification. I can't recall a
>situation where a device is allowed to just "disappear" once plugged in and
>enumerated without the user doing something (a bus-powered device anyway).
>You should see if there is a firmware upgrade available for it.
>
>Then again, I know firsthand that Microsoft had USB Mass Storage pretty
>wildly wrong as late as the release of XP SP...2 I think, maybe 1, so who
>knows, could be MS's fault.
>
>
>
Most cameras have an auto-off function to preserve battery power. I do
not think any of them are actually usb powered when plugged in. I know
that mine will NOT function without charged batteries in it even when
plugged into a port. I suppose that if a camera has the means to turn
off the auto-shutoff function then it will not disappear until the
batteries fail, whereupon it will act like any other externally powered
USB device and become unaccessable. I believe that some cameras come
with an external power adapter that will provide continuous power.
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