To be sure that you will always be able to attach drive C:, you can change the permissions on the drive. Changing the permissions will keep other users from being able to attach drive C: even when you are not using the SunPCi program. To change permissions on drive C:, type the following in a command window:
% chmod 600 ~/pc/C.diskimage
This makes the drive inaccessible to other users.
If your SunPCi window shows the message Non-system disk or disk error at startup, your C: drive may have been corrupted, or you have a non-bootable floppy disk in drive A:. If you do not have a floppy disk in drive A:, delete the default C: drive file in $HOME/pc and then restart SunPCi.
You may want to make periodic backup copies of your C: drive. Refer to Backing Up Your C: Drive for more information.