Hardware backward compatibility: The firmware that missed one tiny detail

Raymond Chen

Raymond

The person responsible for the floppy disk driver in Windows 95 also was responsible for the low-level CD-ROM drivers. (Not to be confused with the CDFS file system, which was handled by the file system team, not the hardware driver folks.) And I remember a story about one particularly strange CD-ROM drive.
This drive was produced by a name-brand manufacturer. The box that the drive comes in proudly announces that it is an IDE ATAPI drive. And they did a fantastic job. They implemented all the ATAPI commands that were defined at the time, with one tiny exception.

They forgot to implement the “Are you an ATAPI drive?” command.

Raymond Chen
Raymond Chen

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