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SD and SDHC cards have a slide switch along one edge. The position farthest from the metal contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card.
Your problem is that you are not using a suitable memory card for the D90. 2Gb SD cards have read/write speeds that are much too slow to work with quality DSLR's. Let me explain. When you take a picture with the D90, the data generated first goes into a small capacity buffer memory. The purpose of the buffer is to act as a conduit to your SD memory card and retain picture data until all of the data is safely written to the SD card. If your SD card can accept data as quickly as the buffer can pass it to the SD card, there is no problem. But, If the SD card is not capable of accepting the data quickly enough, the buffer will start to fill up since data is coming in faster than it is going out. If you take pictures in quick succession with a slow SD card or if you shoot video with a slow SD card, the buffer will overflow; i.e., fill to its capacity and become incapable of accepting more data until its capacity returns as the SD card accepts the data. During that time, the camera will prevent you from taking any more still photographs. You will push the shutter release and nothing will happen. If you are shooting video, the camera will continue to work, but the sound will loose sync with the picture.
For your D90 to function properly under all conditions, you must have an SDHC card that is rated at 45Mbs or faster. When I first bought my D90 several years back, 35Mbs was the fastest card made and I had the problems I described to you above. When Sandisk brought out the Sandisk Pro card with a 45Mbs speed my problems melted away. I should also ad that 2Gb is much too low of a capacity for the D90. It will fill up very quickly if you shoot Raw or fine quality jpeg files. You need a minimum of 8Gb.
The CRH error message means that the lock tab on your memory card is in the locked position. The purpose for the lock switch is to allow you to set your SD card so that you cannot accidently erase your valuable pictures. Remove your SD flash memory card from the camera and hold it in your hand with the label toward you and the angled corner to the upper right. Look on the left edge of the card and you will see a very small slider switch. Make sure the switch is in the fully up position then reinsert it in the D90. If the camera is not generating a false error, your camera should work correctly.
I've been studying the problem for several minutes and actually downloaded the manual from the Nikon site to confirm a suspicion. With the camera software denying the transfer yet other "Windows" application are makes me believe that there is or are corrupt files on the memory card. The Nikon D90 is a "Semi-Pro" type camera and feature packed, however if you have been deleting files and not formatting then the memory card has become saturated with empty files (deleted) what needs to be done each time you down load is format the memory card. Formatting cleans off all the old empty files, restores the memory card to a fresh medium and allows the camera and cart to communicate between each other efficiently. Also one other thing that might have happened is that the protect lock has been engaged. The camera SD card has a lock protection switch on the left upper side (with the letter facing up) this little switch need to be pushed to the top edge towards the gold contacts. I'll supply a diagram, there is also another thing is this a new memory card? if so did you format the card to the camera before you used it? Also your camera has some SD card memory capacity restrictions these are shown on page 242 of your manual.
Take the memory card out of the camera and look at it. SD cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again. Then put the card back into the camera.
You have to take the sd card out and load in in an sd card reader. Then just write it into the video or to the DCIM folder if a picture. You cannot load through the Nikon interface.
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