Thanks John, the cards that could not be read were all 4 GB.
rtm
"John Williamson" <johnwilliamson@btinternet.com> wrote in message 
news:66f1apF2jooj8U1@mid.individual.net...
> Robert Morrison wrote:
>> I have a Toshiba M6 laptop with Windows XP SP2 with built in SD card 
>> reader. The computer/card reader only recognizes some SD cards and not 
>> others (although all can record images from a Canon Xti camera) and copy 
>> the images to the Hard drive via a USB SD reader. Why does the 
>> computer/built in SD card reader not recognize all of the cards?
>> thanks
>> rtm
> Depends on the size of the card, if it's over 2 Gig, then very few built 
> in readers will recognise them. It's a different format entirely.
>
> -- 
> Tciao for Now!
>
> John.