The year 1977 was an important year in the history of home computing. That year, the world’s first microprocessor-driven personal computer was released—not one, not two, but three different models by three different manufacturers: the highly successful Apple II, the Commodore PET and the TRS-80, which actually outsold the Apple II by a factor of five until the early 1980s. All these machines and the ones that came after had cassette tapes for mass storage, because hard disk drives were still very expensive. It was only during the 1980s that personal computers started offering hard drive storages, first as peripherals and later as internal drives.
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Source: amusingplanet.com