I had been using a Transcend 4GB/150X SD card for a week or so, no problem. I went yesterday to do a newspaper job and came home and tried to download the images through my computer's card reader using Lightroom as usual and the computer told me that the card was not formatted. Hum! I put the card back into the camera to try with the USB and the camera said that the card was not formatted. Hum! The images were gone. Now I know they were there because all morning I was occcasionally playing them back. I wrote to Transcend and they told me that Pentax does not recommend using larger than 2GB cards. I cannot find that information anywhere in the manual or on the website. I wrote back and asked where she found the information, but haven't heard back. Has anyone had a similar problem?
u know whats funny, i was talking with a d200 user not too long ago, and he was having issues too with big cards on his D2. same thing, lost is shots...
and those use CF
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K20D
K10D
Lenses from Pentax, Sigma, and Takumar
I have the same issues with the card reader on my laptop, tells me my card is not formatted. The problem might be the file system, FAT for SD versus NTFS for computer, but not totally sure. I simply put mine in a USB SD reader from Lexar and it reads fine. Don't format the card as I am sure yours is ok, try other systems. Also make sure the contact on the card are clean.