Editing IBM 5120 (section)

== Storage ==

* '''2 × 8-inch 1.2 MB floppy drives built-in''' — the defining 5120 feature. The drives accept IBM Diskette 2D media (double-sided double-density, 1.2 MB formatted).
* '''Optional IBM 5114 Diskette Unit''' — adds 2 more 8-inch drives for a total of 4 × 1.2 MB online.
* '''No tape drive''' — the DC300 system from the 5100 / 5110 Model 1 is not available on the 5120.
* '''No hard disk from IBM''' — though Core International offered an aftermarket Winchester subsystem and the CoreNet LAN from 1981.<ref name="core81">Core International, ''1981 5110 Disk brochure''. The publisher's site is long gone and the brochure survives only in the Internet Archive's Wayback Machine, which this wiki's verification tooling cannot reach, so its contents could not be checked. Recorded as attributed, not verified.</ref>