'硬盘' (yìng pán) literally means 'hard disk' — '硬' (yìng) means 'hard' or 'rigid', and '盘' (pán) means 'disk' or 'plate'. Together, they refer to a non-removable data storage device inside computers that uses magnetic platters to store digital information permanently. Unlike RAM, which loses data when powered off, a hard disk retains data even without power. It's one of the primary internal storage components in desktops and laptops.

This term is used almost exclusively in computing contexts — for example, when discussing computer hardware, data backup, system installation, or storage capacity (e.g., '1TB 硬盘'). While solid-state drives (SSDs) are increasingly common, '硬盘' still often refers broadly to internal storage devices, though technically it distinguishes traditional magnetic drives from SSDs (which are called '固态硬盘'). The word appears in both technical documentation and everyday tech conversations.