It's likely that your 4GB card is an "SDHC" card, and your camera is an older camera that was designed before the SDHC format came out. Although SDHC cards look exactly like standard SD cards, they are not. If your camera is a few years old, only SD cards of 2GB or less (standard SD cards) will work with your camera.
But hang onto that 4GB card. One day you'll have a newer camera that will make good use of it.
Your digital camera's memory card will only work in a PSP if it is a Memory Stick Pro Duo adapter.
You can put any memory card into any digital camera, no matter the price as long as it fits correctly.
It is read by a digital piece of equipment, such as a digital camera.
The xD card in your digital camera is a memory card. When you take pictures with the camera, the images are stored on the xD card so that you can access them later.
This is relative to your camera's settings (specifically its resolution) as well as the amount of internal memory your camera has and the size of your memory card.
The memory card is what the digital files are stored on. If you have no memory card in your camera there is nowhere for the camera to store the files. It is like not putting a film in a film camera or trying to burn a CD with no CD inserted to the drive. No Some digital cameras have internal memory so you don't need a memory card. I figured this out 2 minutes before I saw this question.
There aren't any films in a memory card.
this can be remedied in the settings of the camera
a digital camra uses a memory card.
memory card
well, pictures need to be stored SOMEWHERE on your camera, right? just like how our memories store information, memory cards store the pictures you take. a camera without a memory card is about as good as no camera at all.
See the Question: How many pictures on 4GB memory card in 10.2 mega pixel digital camera?(How_many_pictures_on_4GB_memory_card_in_10.2_mega_pixel_digital_camera)