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This article explains how Linux file systems represent file size versus actual disk usage, demonstrates the difference between Size and Blocks using du and stat, describes inode and multi‑level block indexing, and shows why copying a sparse 100 GB file with cp finishes in a fraction of a second.
The article explains why copying a seemingly 100 GB file with the cp command finishes instantly by analyzing file size versus allocated blocks, sparse file concepts, inode structures, direct and indirect block indexing, and how Linux file systems manage storage space efficiently.
The article explains why a 100 GB file can be copied in under a second by examining the difference between logical file size and physical block usage, demonstrating sparse file behavior, inode structure, direct and indirect block indexing, and how these mechanisms affect copy performance on Linux.
The article explains how a Linux file can appear to be 100 GB yet copy in under a second because the file system uses inodes, direct and indirect block pointers, and sparse allocation, separating logical size from actual physical storage.
The article explains why the Linux cp command appears to copy a 100 GB file in less than a second by exploring sparse files, the difference between logical file size and physical block allocation, and how inode direct and indirect indexing enable efficient storage and fast copying.
The article explains how Linux file systems use inodes and multi‑level block indexing to separate a file's logical size from its physical storage, illustrating why copying a seemingly huge file with the cp command can complete instantly when the file is sparse.