Windows File Explorer exposes two properties to represent the size of a file: **Size** and **Size on disk**. These properties differ subtly in meaning. **Size** represents the complete size of the file. **Size on disk** represents the size of the file stream that's stored on the disk. The values for these properties can differ for a variety of reasons, such as compression, use of Data Deduplication, or cloud tiering with Azure File Sync. If a file is tiered to an Azure file share, the size on the disk is zero, because the file stream is stored in your Azure file share, and not on the disk. It's also possible for a file to be partially tiered (or partially recalled). In a partially tiered file, part of the file is on disk. This might occur when files are partially read by applications like multimedia players or zip utilities.
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