The primary advantage of using a solid-state drive (SSD) over a traditional hard drive (HDD) lies in its performance. SSDs have no moving parts, allowing for faster data access and retrieval speeds, which significantly improves system boot times and application loading. This leads to a more responsive user experience. Additionally, SSDs are generally more durable and energy-efficient compared to HDDs, making them suitable for mobile devices and laptops. The speed, reliability, and efficiency of SSDs contribute to enhanced overall system functionality and productivity.