Ov5642 raw format

Hello. I’m experimenting with the 5MP OV5642 SPI/I2C camera. I’ve programmed the registers using the OV5642_1280x960_RAW settings. When I trigger a capture I get a write FIFO size of 1228808 which is 1280 x 960 + 8.

Seems there is 1 byte per pixel plus 8 extra bytes. Is that right? I’d have thought RAW format would use more than 1 byte per pixel. And what is this extra 8 bytes at the end? I have seen that with other formats also.