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What's the drive's exact model? Do you hear any abnormal sounds? I'd try the drive on a Windows system and see if it's detected in the BIOS, Device Manager or Disk Management and how (screenshots would be useful). I'd also try running WD Data Lifeguard Diagnostic tool and see if it recognizes the drive. If it does I'd see if the drive passes both the quick ...


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Regarding the INTh commands you reference (see: BIOS Interrupt Calls), you are correct that this did use to be the way that an OS would access low-level hardware. In a modern machine, these calls (if executed) often end up in the CSM (Compatibiliy Support Module, at least in AMI parlance) which can handle these requests. In the instance of say a video BIOS ...



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