Image Storage - Nikon D300 Complete Manual

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500 images when my battery is low when shooting

Charging Life (charging life) tells you about how

many more uses you can get out of this battery before

you need to replace it. When the small yellow

triangular indicator is above the right edge of the bar

and reads 4, you should consider retiring the battery

and obtaining a new one, as it won't be able to hold

charges well.

Image Storage

While the D300 has an internal memory buffer that

temporarily stores data obtained from the sensor, it uses a

CompactFlash memory card to permanently store digital

When you take a picture, the electrons stored in sensor are

converted to digital values (initially 12-bits in the case of JPEG

and TIFF, 12-bits or 14-bits depending upon what you choose

in the case of NEF files), interpreted by the EXPEED image

processing system, and then moved into an internal memory

buffer. Images stored in the internal buffer are moved as soon

as possible to the storage card. After an image is written to the

storage card, the buffer space it used is freed up. Put another

way: on the one side the D300's sensor and imaging ASIC

(blue items in diagram below) is filling up the buffer, while on

the other side the storage circuitry (green items) is emptying it.

Having a memory buffer is a very important concept to

understand, as it has practical implications:

Thom Hogan's Complete Guide to the Nikon D300