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Thestandard of DAT (digital audio tape) was developed in 1987 and it offereddigital sound of up to 3 hours on single data tape. This technology used therotating heads (helical scan) which was same as that utilized in the VCR (videocassette recorder). DDS was based on the standard of digital audio tape and italso utilized the similar mechanism and technology. The design of the tapecartridge is similar but the tape formulations are different. The errorcorrection of digital audio tape has 2 levels known as C-1 and C-2. On theother hand the DDS tape format has another third level of error correction C-3.This third level recovers the errors that are much severe for the digital audiotape (DAT). Error correction C-1 and C-2 perform their function at track whilethe third level C-3 works over track group.
Thecapacity has reached threshold of 20 GB in the DDS-4 backup tape format. Mediaof DDS4 follows familiar data tape model with increased tape length and moreadvanced formulation of MP-media. Output of the metal particle MP+++formulation is also on the higher side and was designed for supporting thehigher DDS-4 tape format's track densities. Need arose to formulate tape mediahaving the ability to generate superior output signals as the track pitch was reduced.So improvements and advancements were made in several areas of DDS4 data tapemedia besides its MP formulation as its media thickness was also lowered to5.9'm. This made possible to increase the length of the DDS-4 tape reel to 150mfrom its previous tape length of 125m.
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