Rob Owens wrote:
> Hi, I'm new to the list.  I've been on the K12LTSP list for a while, and
> I posted a question there that was never answered fully so I figured I'd
> see if you guys had any advice for me.  
> 
> I have a Sandisk card reader that I'm using successfully on my thin
> clients.  It only has one slot, for SD cards.  Like this one:
> http://www.amazon.com/Sandisk-ImageMate-Hi-speed-SDDR-89-A15-Package/dp/
> B00064V6RG/ref=pd_bbs_sr_1/103-4682886-3202265?ie=UTF8&s=electronics&qid
> =1181768340&sr=8-1
> 
> I also have a Sandisk 12-in-1 usb card reader which requires some
> trickery to use on a thin client, and I'm wondering why.  It's like this
> one:
> http://www.amazon.com/Sandisk-ImageMate-Hi-speed-SDDR-89-A15-Package/dp/
> B00064V6RG/ref=pd_bbs_sr_1/103-4682886-3202265?ie=UTF8&s=electronics&qid
> =1181768340&sr=8-1
> 
> The 12-in-1 card reader works as a local storage device if I insert the
> card, then plug the card reader into the usb port.  If I do it the other
> way around it does not work.  ie, the normal way:  Plug the card reader
> into the usb port and leave it there, then insert the card.  The card
> does not get recognized -- no event is triggered (when I monitor a shell
> on the thin client).
> 

this is because inserting a USB device (such as your card reader) into a 
USB port generates a kernel event that we can detect.  Inserting media 
into a card reader doesn't generate such an event.

One way around this is to constantly poll the reader, to see if there 
was a media change.  this is how we do CDRom detecting.  We don't 
currently do this for usb card readers.  There might be something in 
LTSP-5 for doing this, but you'd have to ask Scott Balneaves.  Best 
place to talk about this is on the #ltsp IRC channel on irc.freenode.net.

Jim McQuillan
[EMAIL PROTECTED]


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