It doesn't matter if a disk was being formatted with CrossDOS or it's an Amiga disk, you always can format it.
Just be sure that you're using the right formatting method.
Because there are some different format methods in CrossDOS, like: MSDOS 360k Format, 720k Format, 1.44M Format etc. Always use 720k Format. Though that should be the default even when you don't use these format methods. If you have mounted PC0: (meaning the PC Floppy disk) and inserting a disk, you will see 2 floppy icons on Workbench.
If it's a PC disk, then you'll see a floppy icon named DF0:BAD and another floppy icon with a name, probably the name set for the disk on PC. If it's an Amiga disk, then you'll see the Amiga floppy with a name and a PC0:BAD floppy icon.
So if you want to format it as an Amiga disk, then select the AMIGA floppy disk icon (DF0:), and select format from the menu. That will create a nice Amiga formatted disk.
I you want to format a PC floppy, then select the PC floppy disk icon (PC0:) and select format from the menu.
If you have an ESCOM Amiga, i would suggest you to use DD (Double Density) floppies, or just use a tape on the hole in the left upper edge (when holding the floppy with sticker side to your face). :-)
You also can try to clean the floppy drive and check again. It's a real dustbin. :-)
If all that fails, then your floppy drive might be having problems. Mine had problems and i had to replace it. :-(
Now the new one works perfectly! :-D
