Do you have a disk in your computer to keep data on? Really? It must be quite old then. Most of us are switching to solid-state devices.
And even if your hard disk really is spinning rust, it technically isn’t one disk; it’s a number of them (individually called platters).
IBM terms all appropriate storage devices DASDs (direct-access storage device) which because it refers to what the storage device does rather than describes how it is constructed. Except for the difficulty pronouncing it, it makes a far better name.
How about cheating and referring to them as DASes?