The random-access, low-density storage of disks was developed to complement the already used sequential-access, high-density storage provided by tape drives using magnetic tape. The first commercial digital disk storage device was the IBM 350 which shipped in 1956 as a part of the IBM 305 RAMAC computing system. In the music industry, analog recording has been mostly replaced by digital optical technology where the data is recorded in a digital format with optical information. Similarly the first video disc used an analog recording method. Audio information was originally recorded by analog methods (see Sound recording and reproduction).
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