The D3000 can store still images in two different formats. JPEG is a standard format, recognized by just about every image viewer and image manipulation program in the world. RAW is actually NEF (Nikon Electronic Format), a Nikon-proprietary format which incorporates almost all of the data captured by the sensor, without the processing of JPEG. JPEG files have the color balance, sharpening, contrast, and all the other camera settings done on the picture. With RAW files, you can change any or all of them and produce new JPEGs. In this respect the RAW file is similar to the original negative you get from processed film, while the JPEG file is like the final print. RAW files need special software for viewing and editing.
All JPEG files are compressed to save space. FINE, NORM, and BASIC represent different levels of compression. FINE does the least compression and takes up the most space, BASIC does the most compression and takes up the least space. Compression always loses some quality, so in general the less the compression the better the quality.
RAW+B simply stores each of your pictures as a RAW file and a BASIC JPEG file.
Having said all that, you should use only RAW or FINE settings. You didn't buy a SLR only to throw away picture quality, did you?
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