NAS structure introduction: When talking about NAS, there are different models in the market that can connect to a variety of storage.

However, the current mainstream leading data storage still goes to the 3.5-inch hard disk because of price and storage volume.

Since the 3.5-inch hard disk connected to the machine inside has to respond to an unexpected situation of hard disk damage that may occur at any time.

So there is a need to make sure user can replace the hard disk without stopping the machine.

To allow various hard disk manufacturers to have a uniform appearance size, and reduce the product and increase versatility.

The SFF (Small Form Factor) committee has developed a standard 3.5-inch hard disk structure size that allows product developers to follow the specifications.