When unable to find Double Density (720K) diskettes, you can use readily available High Density (1.44MB) diskettes in your Model 658 with this easy trick.
Take a look at a diskette. The High Density diskettes have two square holes along the back end; One is the write-protection slot, the other indicates to the drive the the diskette is a High Density (1.44MB) type.
The Double Density (720K) type had only one square hole (the write-protection slot). The 658 was designed for this older diskette.
To make the newer disks usable in the 658, simply cover the second hole with a piece of masking tape (or any other decently opaque tape such as silver labels). Be sure to format the diskette in the 658 before use.
Having been let down more times than I care to remember by this advice given by Dranetz-BMI, I decided to find a more reliable solution to the problem.
If there are any questions please ask.
Note: This web page does not form part of any official documentation.
© M.T.P. - 27.07.06