The most carefully produced CD-Roms can sometimes generate read errors, even when using the latest version of MSCDEX.

Often, this is due to a fault during the disc duplication process. But when a program refuses to install or run from a CD-Rom, and displays no helpful messages, how can you tell if it's a genuine disc fault or simply a result of bad programming?

CDTEST is a utility written specially to scour any CD-Rom for data errors, reporting not only the total number but the files in which they occurred.