It's like having an iPod with an infinite amount of storage space. Now imagine that you could store all the music you have now, plus all the music you'll ever buy, as MP3 files, and that you'd never have to worry about whether you have enough space to store your whole collection. Unfortunately, the cards, like iPods, can still only store so much at one time. This eliminates the need to repeatedly upload and erase files you just switch out the card when you want different music. Some manufacturers have produced players that use removable media such as SD cards. While personal stereo capacities have increased, they still have finite storage space. In its first ten years, iPod models went from 5 GB to 160 GB in capacity, letting you store days worth of music on a single, small device. In 2001, Apple released just such a device: the iPod. With the invention of new digital file formats like MP3, the next logical step for personal stereos was storing and playing music as digital files the same way you would on a computer hard drive. Audio cassettes only held up to two hours of music, and CDs about an hour and a half. For several years, the brand name Walkman was as popular as the name iPod today, being as synonymous with personal stereos as Kleenex is to facial tissue.Īs technology progressed, so did the storage capacity of the media used in personal stereos. If you had a Walkman, you could take your favorite tunes with you anywhere in a small, lightweight package. As simple as it was, the device revolutionized the way people listened to music. The original Walkman was a handheld, battery-powered cassette player with stereo headphones.

On July 1, 1979, Sony Corporation began selling the world's first personal stereo device, the Walkman.

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