For the SD card itself, RAW burst shooting is generally the heavier write load. RAW files are large, and a burst can fill the camera buffer quickly, after which the camera slows down while the card catches up.

HD video is usually more demanding on the camera’s processor because it must compress and write data continuously, but the data rate to the card is often lower than repeated RAW bursts. A rough example from the answers: if video writes around 5 MB/s and each RAW file is about 20 MB, then one RAW shot every four seconds matches that video data rate—bursts exceed that easily.

That said, your D7000 manual recommends at least a Class 6 card, so a Class 10 card should generally be adequate for both. Class ratings are minimum sustained write speeds, and real-world performance can still vary between brands and models.

Best advice: test your exact card in your camera. Record a few minutes of HD video and shoot several RAW bursts. That will tell you more reliably than reviews whether your card works well in your D7000.