Apple Power Macintosh 4400 - Manual (Page 131)

m The disc may need to be cleaned. (See “Handling CD-ROM Discs” in the
section “Handling Your Computer Equipment” in Appendix A.) If there are
visible scratches on the shiny side of the disc, you may be able to remove
them with a CD-ROM disc polishing kit (available from your audio CD
dealer). If the scratches can’t be removed, you need to replace the disc.
m The disc may be damaged. Try another disc in the drive, and try the
original disc in another drive. If the original drive reads other discs or if
the original disc also doesn’t work in another drive, the disc is probably
damaged. You need to replace it.
You can’t open a document on a CD-ROM disc.
m Try opening the application program first; then open the document.
m Read the manual that came with your CD-ROM disc. Some discs come with
software that you need to install on your computer before using the disc.
You can’t save changes you make to information on a CD-ROM disc.
A CD-ROM disc is a read-only medium. This means that information can be
read (retrieved) from it, but not written (stored) on it. You can save the
changed information on a hard disk or floppy disk.
Problems using ISO 9660 or High Sierra discs
You cannot access files on a CD-ROM disc that uses the ISO 9660 or High Sierra format.
m Discs in the ISO 9660 and High Sierra disc formats have version numbers
attached to file names. Some application programs need these version
numbers in order to work with files. To make the version numbers
available to programs on your computer, follow these instructions.
Drag the CD-ROM disc icon to the Trash. When the tray opens, hold down
the Option key while you push the tray back in. When the disc reappears
on the screen, release the Option key. The program you are using should
now be able to locate file names on that CD-ROM disc.
m Make sure that Foreign File Access, ISO 9660 File Access, and High Sierra
File Access are present in the Extensions folder in your System Folder on
your hard disk.
131 Troubleshooting