Compaq Armada 7400 Reference Manual page 78

The drive stores (writes) information to and reads information
from a 3.5-inch diskette.
You can use the following diskette capacities: 1.44 megabytes,
720 kilobytes, 1.2 megabytes.
1.44-MB high-density (HD)
1.2-MB high-density (HD)
720-KB double-density (DD)
1. Hold the diskette by the edge covered by the label, label facing
up.
2. Gently push the diskette into the drive until it clicks into place.
The drive button ejects to show the diskette is inserted correctly.
Approximately 250 full pages
Approximately 200 full pages
Approximately 125 full pages