The main difference between FC frame (Fibre Channel frame) and Ethernet frame lies in the type of network technology they are associated with.

FC frame: - FC frames are used in Fibre Channel networks, which are typically deployed in storage area network (SAN) environments. - They use a specific protocol and format for data transmission, and are designed specifically for high-speed, high-reliability storage networking. - FC frames are typically used for transmitting storage-related data, such as block-level data for applications like database and file storage.

Ethernet frame: - Ethernet frames, on the other hand, are used in Ethernet networks, which are the most commonly used type of local area network (LAN) technology. - Ethernet frames are used for transmitting a variety of data, including computer-to-computer communication, internet access, and multimedia streaming. - Ethernet frames are designed to be compatible with a wide range of networking equipment and protocols, and are widely used in both enterprise and residential networking environments.

In summary, the main difference between FC frames and Ethernet frames is the type of network technology they are associated with and the specific data transmission needs they are designed to meet.