SDX4-200W Sony Data Cartridges has AIT-4 Write-Once-Read-Many (WORM) format protecting valuable data against accidental erasure and preventing alteration of archived data files. High storage capacity of up to 520GB compressed data (200GB native). Fast data transfer using efficient Helical Scan technology, up to 24MB per second sustained native transfer rate. Proven reliability and durability with a 30 year media life thanks to AME II technology (Advanced Metal Evaporated). Quick access provided by AIT's unique Remote Memory-In-Cassette (R-MIC) incorporated into the cartridge.