A barn storage unit is composed of four components: a BALE, a LOFT, a BIN, and a byte. A BALE is a bundle of hay or straw, usually tied together with twine or wire, and is commonly used for animal feed. A LOFT is an upper room or storage area in a barn, typically located directly below the roof. A BIN is a container used to store items such as grain, feed, or hay. Finally, a byte is a unit of digital information that typically consists of eight bits. Together, these four components make up a barn storage unit.