Definition
A 'fixed disk' is simply an older, less common term for a hard disk drive (HDD). It emphasizes that the disk platters are permanently installed within the drive and not removable, unlike floppy disks or optical discs. It's the primary non-volatile storage in a computer, where the operating system, applications, and user data reside. Think of it like the built-in bookshelves of your computer. The term arose to distinguish it from removable storage options. While 'fixed disk' is less used now, the concept remains the same: permanent data storage.