This HP 4mm Data Cartridge can store up to 40GB of compressed data or 20GB of uncompressed data at any one time. The small high capacity cartridge is ideal to backup, restore, archive, copy, distribute or manage your data simply and reliably with the HP robust mechanisms. Electronically tested to withstand a minimum of 2,000 passes or 100 backups, the data cartridge is high performing and reliable at a great value price.