Hi flashmakeit, Your hard disk which comprises a cylinder of disks separated by space, spins at a very fast rate. Information has to be written onto it, or extracted from it via the reading/writing device that is forked like your fingers, with read/write heads at the tips. This device has to quickly slip in between the spinning disks to either read data from the disks or write data on the disks at your command.
I bet Norton's report on disk read or disk write refers to the rate at which these activities are taking place. The rest of the message is necessary to further comprehend the full report.
your cdrom has both the ability to read data in disks and to write data on them.unfortunately you haven't given us much of that error message but the problem could be in the disk,it may be scratched or partially damaged and thus the cdrom is unable to read or write data or you may have a more serious problem in the CD ROM itself which u should have checked out.another possibility is that the program(Norton) needs an update or something that is on disc.i'm no whiz but i hope I've helped