CP/M disks recognizing

[MIRKOSOFT]

Hi!

Longer time ago I programmed File Manager for C64 but has one error: when I start browsing CP/M disk, don't display items and freezes.

So, how to recognize CP/M disks before reading directory?

I want to create File Manager for C128 and don't want this error and if is possible to explain me how to read directory of CP/M disks and show items...

Thanks for help.

Miro