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"Sony tackled skipping in the their discmen through mechanical & design improvements, reinforcing the chassis & refining servo mechanisms to stabilize the laser’s tracking. Still, the basic system struggled with vibrations, especially during movement, falling short for active users. By 1992, Sony cracked the code with ESP which introduced a small RAM buffer that pre-read and stored 3 seconds of audio data. In 96, Sony extended ESP to a 20-second buffer. Unlike later systems, its larger buffer relied on increased memory rather than advanced reading techniques. Sony’s anti-skip quest peaked in the late 90s with G-Protection, which combined a 40-second buffer with shock-absorbing mounts and refined laser tracking. By the end of its life cycle the CD Walkmas could belt out tunes for up to a whopping 115 hours on a mix of gum-stick and AA batteries." https://obsoletesony.substack.com/p/how-sony-solved-the-discmans-biggest
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