Meaning: Able to withstand attack. Synonyms: unassailable; unattackable; impregnable; inviolable; secure; strong. Context examples: an impregnable fortress / fortifications that made the frontier inviolable. Similar: invulnerable (immune to attack; impregnable)
Definition - What does Magnetic Disk mean? A magnetic disk is a storage device that uses a magnetization process to write, rewrite and access data. It is covered with a magnetic coating and stores data in the form of tracks, spots and sectors. Hard disks, zip disks and floppy disks are common examples of magnetic disks.
A floppy disk is a magnetic storage medium for computer systems. It came in several different sizes, including the 8-inch and the 3.5-inch, and is composed of a thin and flexible magnetic disk sealed in a square plastic carrier. The different types of floppy disks required a different floppy disk drive.