UDF File Documentation

Overview

Feature Value
File System Type Universal Disk Format (UDF)
Developed By Optical Storage Technology Association (OSTA)
Introduced 1995
Latest Version UDF 2.01 (revision)
MIME Type application/vnd.iso9660-image
ISO Standard ISO/IEC 13346 & 13490
Primary Use Data storage on optical media
File Allocation Space-efficient with both fixed and variable-sized files
Max File Size Depends on the used UDF version, up to 16 EiB (UDF 2.01)
Max Volume Size Up to 8 TiB (depending on the sector size)
Character Encoding Wide variety, including UTF-8 and UTF-16
Media Type Compatibility Optical discs (CD, DVD, Blu-ray), and also widely supported in solid-state and magnetic disks
Partition Styles Physical, Virtual, Sparable, Metadata
Data Structure Managed by Logical Volume Descriptors, File Set Descriptors, File Entry, Extended File Entry
Directory Depth No specified limit
Metadata Support Comprehensive, including file timestamps, permissions, and user-defined metadata
Compatibility Wide cross-platform compatibility (Windows, Linux, macOS)
Error Handling Built-in integrity and error recovery mechanisms
File System Features Incremental writing, defect management, allocation domains
Security Support for file and directory permissions, encryption not standardized
Standardization Managed by the Optical Storage Technology Association