IBM Digital Linear Tape (DLT) 1/2" tape cartridges are precision-manufactured to tight specifications, assuring consistent high quality and reliability. All IBM media products reflect the high standards of a leader in media and storage-drive technology. As a Total Storage Solution Provider, IBM developed many of the storage technologies used today - and continue to set media standards.IBM quality, support and technology combine to make IBM Choice Media a value leader in 4mm storage products. This cartridge is read/write tested and IBM certified for superior reliability - over 30 years archival life and more than 1, 000, 000 head passes in normal environments. It has two visible reel-lock indicators, show open or damaged locks, to protect valuable drives.