Floppy Disks; Table 1-2: Floppy Disk Specifications - Datatech Enterprises Apex 386SX/20 User Manual

Floppy Disks

With a floppy disk drive you can format and use double-sided (or
single-sided) double-density
One double-sided double-density 5.25" floppy disk can store up to
360KB of data. One double-sided high-density 5.25" floppy disk can
store up to 1.2MB of data, One standard 3.5" floppy disk can store up
to 720KB of data, One high-density 3.5" floppy disk can store up to
1.44MB of data.
Table
Note:
18 Chapter 1: System Overview
1-2: Floppy
Disk
• Only high-density floppy disks can be formatted to high
capacities of either 1.2M for 5.25" or 1.44M for 3.5" floppy
disks. You may lose data if you use a low-density floppy
disk formatted for high density.
• You can't use a high-density disk in a low-density disk drive.
high-density) floppy disks.
(or
Specifications