Transfer of images from Mac to SD card

I don't understand why you would want to transfer pictures from the computer to the camera. Normally you transfer pictures from the camera to the computer. But, if you really want to restore pictures to your camera's memory, you can remove the SD memory card from your camera and transfer the pictures on any computer equipped with an SD card reader/writer. These devices are built into most Apple computers, many PC's and are available as USB accessories for all other computers. I have seen them for under $20. When you connect the device and insert your camera's SC card, your computer will recognize the card and treat it as if it were another hard drive. You will be able to read or write or drag and drop picture files just as you would with any other file on your computer. By the way; most professional photographers use this method to transfer there photos rather then transferring them using a USB cable from the camera.

The Nikon download software is called Nikon Transfer 2. I would remove the SD card from your camera and slide it into the SD slot on your Mac. If you have an iMac, the slot is located just below the CDROM slot on the right side. Do not do this by feel. Look as you insert the card because if you insert it in the CDROM slot, you may not be able to extract it. If you have a MacBook or MacBook Pro, check the manual for the location. When the computer recognizes your SD card, it will either open Nikon Transfer 2 or a folder will appear on your desk top. If Nikon Transfer does not open, just copy your pictures from the SD card folder to a folder on your Mac.

This may be due to a slow or faulty memory card. If the card is damaged, etc. the camera may be "hung up" trying to transfer the image from the buffer to the memory card. Only after this process is complete, can it attempt to display the image to you on the screen. After the images are on the card, and you want to display one or more, the whole process begins again with the camera trying to read the data from the card to be displayed on the screen.

Try again with a new / different card. Be sure to FORMAT the card in the D90 (not in a card reader / computer, etc.) prior to taking any photos.

If you still have problems, you may need to send the camera in to Nikon Service for repair.

Please remove the SD card from the camera. Connect the SD card to the computer using the external memory card reader and then transfer all the images in the computer or laptop. Then try to open all the images.

If you want to send pictures FROM the computer TO the camera, you must use a card reader. You can drag-n-drop pictures to the card the same way you transfer any other files. Be aware that if you've done any editing to the picture then the camera may not display the picture.

You can use a card reader to read or transfer your images from your SD memory card via the USB port. You can use the "copy & paste" or you can use the mouse to drag the images to transfer to location on your PC.

Hope it helps.

Try downloading the upgrade again but save it to your desktop this time. Then, you can drag and drop the upgrade to the SD card.

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.

Diagram

You can download the current versions of all (free) Nikon software from
http://support.nikontech.com/app/answers/detail/a_id/61

Depending on the program you're using, it may or may not delete images after downloading. Some programs give you an option to do this.

You need to use a memory card reader that is compatible with a SD card that is being used with your camera