or looked closely at your disc drive, you might have seen a cryptic name: HL-DT-ST DVDRAM GUE0N
is the specific model or firmware revision number. This number helps identify the drive's hardware revision, buffer size, and supported write speeds. Variants of this drive include the GU90N, GU60N, and others. The GUE0N typically indicates a later firmware revision with improved media compatibility and bug fixes. hl dt st dvdram gue0n top