Convert DVD (2 layer, 2 side) (DVD (2L, 2S)) to Block (block) instantly.
About these units
DVD (2 layer, 2 side) (DVD (2L, 2S))
The dual-layer, double-sided DVD provides the maximum DVD capacity: 17.1 GB. With two layers on each side, these discs offered exceptional storage for large software packages, high-definition video masters (before Blu-ray), and professional archival applications. However, they were rarely used in consumer markets due to cost, complexity, and the inconvenience of double-sided handling. They remain an interesting pinnacle of DVD engineering—pushing the medium to its physical limits.
Block (block)
A block is a unit of data storage used by file systems, typically ranging from 512 bytes to 4096 bytes, though advanced systems may use even larger sizes (8 KB, 16 KB, etc.). Blocks form the fundamental allocation unit for disk storage—files occupy blocks on disk, and file systems track which blocks belong to which files. Block size has significant performance implications. Larger blocks improve read/write throughput but may waste space for small files (internal fragmentation). Smaller blocks offer precision but reduce I/O efficiency. Many classic file systems (FAT, ext2), modern ones (ext4, NTFS), and network storage systems (ZFS, Btrfs, distributed file systems) all rely on block-based allocation. Blocks bridge the gap between raw physical storage and abstract file structures.