If your web browser formats this page incorrectly, try viewing the page source. In netscape 4, click the view menu, then click page source. If there is an error reading from a disk, cdrom etc; then that is a kernel driver error. The kernel driver may or may not display an error message. Even if the kernel driver does display an error message, you may not see the message because it may scroll off the display, or it may be displayed to a different console. The kernel will NOT report the error to the program which requested the data. Some programs like gzip may realize that something is wrong with the data. Other programs like cp will never know that something is wrong with the data. I do not know how to make a shell script which can detect such errors.