I have pentax total station R-425VN. When you switch on it gives sd card error. Even if you remove the SD card it gives the same error

SOURCE: Largest capacity SD card for Pentax Optio S5N

The maximum supported size is most likely 2GB SD Card. Cards with 4GB and more are following a new (incompatible) standard called SDHC (SD High Capacity), SDHC cards work only in devices specifically supporting SDHC. The Optio S5N uses the old SD standard where 2GB are the maximum size.

SOURCE: Nikon D80 SD Card slot problem

Is it slightly thicker on the contact end, Or is something stuck on the flat corner? try getting a needle and picking out any plastic that could be stuck there. Is the card under warranty? 

SOURCE: 8GB Sd card error

Hi!

For SD type memory card, the A800 can support up to 2GB only.

Your camera can also support other memory types at higher capacity - please refer to this link for complete details:

http://www.fujifilm.com/products/digital_cameras/accessories/card/a/index.html

I hope that helps!

Good luck and have a nice day!

SOURCE: my pentax k100d has a memory card error

Trun the camera off and remove the batteries. Leave it for at least a minute before inserting the batteries. Put the car in and turn the camera on.

The firmware in these cameras can get confused. Removing the batteries for a minuite or two will allow the camera circuits to discharge and so it will reset from start when powered-up again.

If this does not work then the camera may need to be sent away for repair. This need not be expensive it could be as simple as re-programming the camera. (Their program memory is writeable and so it can be accidentally altered under certian circunstsances. It may be possible to do this yourself using the downloadable firmware upgrade, but I would let someone else try thet first!)

However, it is just possible that the new card is also faulty!

Check the cards in your PC by obtaining a SD card reader to allow you to plug it directly into your PC.

For reference I would always recommend inserting and removing memory cards with the camera turned off. I would also use the SD card reader to load the images into the PC. Unplugging devices form the USB port can be harmful to some devices. Check the bottom right of your PC screen for an 'safe unplug' icon when things are plugged in.

SOURCE: SD card Protected

It sounds like the tiny locking switch on the SD card has accidently been set to "lock". Remove the card from the camera and slide the switch to the opposite position. That should do it.