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HL-DT-ST DVDRAM GUC0N drive has suddenly disappeared from "My Computer" or stopped reading discs after a Windows update, you aren't alone. This UltraSlim internal drive, manufactured by Hitachi-LG, is standard in many Acer, Lenovo, and ASUS laptops. The good news is that most issues are software-related and don't require a hardware replacement. Here is how to get your drive back online. 1. The "Clean Slate" Reinstall Since this drive uses standard Windows drivers, manually searching for a "GUC0N driver" file online often leads to sketchy download sites. Instead, let Windows reinstall the official generic driver: Right-click the button and select Device Manager DVD/CD-ROM drives Right-click HL-DT-ST DVDRAM GUC0N and select Uninstall device Restart your computer. Windows will automatically detect the drive and reinstall the correct driver on boot. 2. The Registry "Filter" Fix If the drive is still missing, corrupted "UpperFilters" and "LowerFilters" in your registry are likely blocking it. , and hit Enter. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} In the right pane, look for UpperFilters LowerFilters Right-click and 3. Check for Power/Connection Issues If the drive doesn't even eject when you press the physical button, it might be a hardware or power issue: HL-DT-ST DVDRAM GUC0N driver corrupt - Acer Community
Here’s a step-by-step guide for finding, updating, or reinstalling the HL-DT-ST DVDRAM GUC0N driver (commonly found in older HP laptops, e.g., HP Pavilion dv6).
1. Identify the issue Common problems with this drive:
DVD/CD not recognized in File Explorer Yellow exclamation mark in Device Manager Drive disappeared after a Windows update Error code 19, 31, 32, or 39 hl-dt-st dvdram guc0n driver
2. First try: basic Windows fixes Method A – Show hidden devices
Press Win + X → Device Manager Click View → Show hidden devices Expand DVD/CD-ROM drives If you see “HL-DT-ST DVDRAM GUC0N” but it’s grayed out, right-click → Uninstall device → restart PC.
Method B – Remove IDE/ATAPI filters (fixes Code 19/39) HL-DT-ST DVDRAM GUC0N drive has suddenly disappeared from
Open Regedit as admin. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e965-e325-11ce-bfc1-08002be10318} In the right pane, delete UpperFilters and LowerFilters (if present). Restart PC.
3. Reinstall the driver
Device Manager → DVD/CD-ROM drives → right-click the HL-DT-ST drive → Uninstall device . Restart Windows – it will reinstall the generic Microsoft driver automatically. Here is how to get your drive back online
4. Download official driver (rarely needed) This drive uses Microsoft’s built-in CD/DVD driver (cdrom.sys). However, the chipset/storage controller drivers matter:
Go to HP Support → enter your laptop model → download latest Chipset and Intel/AMD SATA/AHCI drivers . Direct driver for GUC0N doesn’t exist – it’s firmware, not a separate driver.