Nikon 5700 wont read cf card - Nikon Coolpix 5700 Digital Camera

SOURCE: CF Error - Card cannot be used

Your problem sounds as if there's a bent pin in the CF card holder inside the camera. To fix it you will have to be very careful with a long blade fine screwdriver. Remember you'll have to straighten it in one go. If you bend them twice you can bet they'll break. A powerfull light to see the bottom where the pins are is needed too. If you're not willing to do the job yourself there's a guy on Ebay USA who straightens them. BMW

SOURCE: nikon 5700

I think it should take more that 4G's. Maybe it was the way you inserted the SD card. These Nikons can be a bit funny about such things. So if you haven't already sorted the problem I'd suiggest you turn off the camera. Remove the batteries then remove the 'other' SD card. Then reinsert you bigger capacity SD card then the batteries. Then turn on the camera. It's just like re-booting a windows computer. Hopefully it will come up 'roses'. Cheers

SOURCE: Nikon coolpix 5700 shows no memory left after purchasing a new card & batteries

The largest CompactFlash card that Nikon approved for the 5700 is 256MB, which is what I'm using in my 5700. That's small by today's standards and you probably won't even find it in stores. I see some web sellers have 256MB cards for only $6 or so. Other commercial card sellers on the web claim that the 5700 will handle CF cards up to 1GB capacity. That's what I might try since online they're selling for as little as $8 plus shipping. Given that the 5700 was introduced in 2002, any cards bigger than 1GB probably won't work.

SOURCE: Trying out new 4G SanDisk cf memory drives in Nikon Coolpix 5700

There is a simpler solution. Just do this: 1. format the card in the camera 2. Connect it via card reader to your PC 3. Copy a little over 2Gb of data to the card - to a different folder 4. Put the card into the camera 5. It should work now... This way you can save some valuable data to the remaining 2 gigs of the card. Note: This has been tested on Nikon Coolpix 5400, but should work on 5700 as well

SOURCE: I have a Nikon E5400, ver 1.3. I bought a 4GB

I'm assuming you tried to format the card in the camera. If there's a firmware update for your camera, by all means, get it.