Here's a brief example of how allocation units, the size of allocation units, and the volume of your storage drive are related. This can result in inefficient storage in some extreme cases, but we'll go into that in more detail later.
If a file is smaller than the block size, then it will be stored in that block, but the entire block volume will be used up. If a file is too big to fit in a single block, then it will be split and span multiple blocks.
The term block is typically seen when talking about Linux, especially the ext4 file system, whereas cluster and allocation units are seen with Windows. The term "Allocation Unit," "Block, " and "Cluster" all refer to the same thing in this context, and we'll use them interchangeably in this article.
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