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.
The tape of DDS4was made thinner but it was essential that the rigidity and strength of thetape should be same as that of its previous DDS tape media had. Its durabilitywas also increased so that it could tolerate the higher speed of the rotationaldrums that are essential for the increased data speed. The conflicting needswere resolved by the back coating the tape media layers and by enhancements inbase film. The base film was made smoother for resolving issues of signal dropoutand noise modulation in helical scan as its speeds of head to tape is veryhigh. Its base film is also very tough and therefore it can bear the high speedediting & searching.
Modulation noiseis reduced and the ratio of signal to noise is also enhanced in the base filmof DDS-4 backup tape format. Tough base film of DDS-4 limits the contractionand expansion of the data tape in extreme temperatures (both very low andhigh). Smooth tape surface and back coating lowers the noise, maximizes theefficiency and achieves higher friction coefficient. Back-coating of DDS4 datamedia is specifically designed for helping the DDS data tape in achieving idealfriction that perfectly fulfills the conditions with DDS data tape drive. Backcoating of DDS-4 media is very conductive in nature and it protects the tapefrom the errors, dropouts and prevents electric charges from attracting dust.
DAT-72tape media is based on the foundation technology of previous media format ofDDS for achieving 36 GB native recording capacity. Metal particle formulation(MP++++) is used in the DAT72 tape media. The recording capacity of DAT-72 tapeformat is almost 80 percent more than the DDS4 technology because of theadvancements in four major areas. These areas of advancements are the increased170m tape length, increased density of tracks, advancement in the recordingdensity and increasing it to 162 KBpi from 122 KBpi, and higher transitioningof MP formulation's output.
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