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File Allocation Table(FAT) is the name of a computer system architecture and a family of industry standard file systems utilizing it. FAT32 is the 32 bit version of the FAT file system.
Field of View
Field of view is the part of the world that is visible through the camera at a particular position and orientation in space. It is most often expressed as the angular size of the view cone, as an angle of view. http://www.zmodo.com/tools/fov_demo/default.html
If your DVR has a menu option that is called "File Length", it is the amount of time that the DVR will record before creating a new file. The default setting on most DVR’s is 60 minutes.
In electronic systems and computing, firmware is the combination of persistent memory and program code and data stored in it. Common reasons for updating firmware include fixing bugs or adding features to the device.
The term "Format" applies to the hard drive within the DVR. It will erase all the data that is on the hard drive as if you have installed a brand new hard drive within your DVR.
The frame rate is how many pictures per second the DVR takes in order to make up a video file. 30 frames per second is comparable to real time.