I want to format a pc disk (on the pc)so that it can also be read on my amiga
:huh: Any chance you mean that you want to put an Amiga floppy disk in your WindozeXP computer and format it so that both your PC and Amiga can read it?
If so the correct command is:-
Format A: /t:80 /n:9

Just used the command on an Amiga disk then put it in an A1200 Desktop and it works fine :pint:
On the Amiga you have to double click on PC0 which is usually in Workbench:Storage/DOSDrivers.
If using a 1.44MB PC disk in a HD drive on the Amiga, see the post by Matt_H above :-)