| I had a similar problem with my camera, but i found a cheap and easy solution. For reasons totally unknown to Pentax, Hewlitt Packard or Microsoft, when i plug the USB cord from my Pentax *ist DL into the computer, the computer does not recognize it. At first i thought it might be a problem with the camera software, so i extracted and reloaded the camera software, but no luck. Then I thought it might have been a defective USB cord. so I replaced that with a new OEM Pentax USB cord, still no luck. In the mean time, I had ordered a couple new Sand Disc 2gb SD cards from Ebay and one of them came with a free USB adapter. The SD to USB adapters are translucent plastic about 3"L, 1.25" w and 3/8" thick. On one end of the adapter you remove a cap and slide your SD card into the adapter, then remove a cap on the opposite end revealing a USB plug, which plugs into the computer. In a sense the adapter converts the SD card into a travel drive. When you plug it into the computer an LED light inside the adapter body lights up and the computer recognizes it as an external storage device or travel drive. If you then open "My Computer" you will see it listed with the appropriate dive address, which in my case is drive (I). You can then click on the drive indicator in my computer and it will open a window and list all the files on the SD card, or you can open a program on your computer and open or save files to the drive address in the normal manner. I have since went back to Ebay and purchased two more of the adapters for $3 each, with free S&H. I keep one in my camera bag and the other two at the computer. Not only did this solve the original problem, I have since acquired a couple 16GB and one 32GB SD cards, which I now use for external storage of photo's, music files and data files, thus freeing up considerable space on my computer hard drive. The only thing i noticed it that when you are finished with the external drive you should find the small icon marked "Safely Remove Hardware" on your desktop start up list (bottom right, near the clock). Click on the icon and a window appears listing the adapter as an external mass storage device. "Click stop". Ths light goes out inside the adapter and another window appears telling you it is save to remove the hardware. You then unplug the adapter, pull your SD card our and its ready to go back to your camera or to your picture frame. According to the specifications with the adapters, they will also handle mini- SD cards, although i have no personal experience with those. | 
