It can never get to that. Here's why.
When you move a piece of data from one device to another, that's not all that has to be used. In a standard network, there are many layers to ensure that the data reaches the intended device.
Let's say that you have a piece of data 1KB in length which is being sent over TCP/IP on an Ethernet network. This is known as the packet payload. The payload is supplied a TCP header which provides critical information on the exact conversation in use. This header/payload combination then gets an IP header which provides information on which networks are in use. This packet is then encapsulated in an Ethernet frame for use on the local subnet.
At a minimum, the TCP header adds 20 bytes, the IP header adds another 20 bytes, and the Ethernet frame adds 38 bytes, for a total minimum overhead of 78 bytes. Technically, this is part of the transfer, but in effect, it reduces your payload throughput. In the above 1KB example, you lose about 3.7% of your bandwidth on just the one packet. There are other things that get in the way such as ARP requests and replies, the initial handshake to start the conversation, retransmits, and so forth.
In practice, one should never plan to get more than 90% of link bandwidth, and that's often generous. Many chips max out at about 80% to 85% just for 100Mbps, and it's been around for 15 years or so. Gigabit chips, as stated before, still often do not get up to the higher speeds, and then it often requires using jumbo frames (which can be up to 9KB in size, compared to the norm of about 1.5KB) to reduce overhead.
And as you said, the hardware all has to be able to feed it at this speed. Hard drives can't provide the data that fast except in very expensive, high-end RAID arrays. A data bus might not be able to pass the data that fast even if it is supplied, and the NIC may fall short. Even the CPU becomes a factor in some cases. Then you have the equipment on the other side -- it has to be able to accept the data, pass it to its own storage, and write it that fast. It's all very hard to do at such speeds.
If I show up at your door, chances are you did something to bring me there.