Sunday 3 December 2017

What is the trailing "D" in Windows Event Log disk error details?

Sometimes in the Windows Event Log you may see an error or warning about disk problems regarding something like:


\Device\Harddisk0\D.

Presumably, the Harddisk0 refers to the first physical drive as reported by the Disk Management MMC snap-in (though I have personally never seen anything other than disk 0 being reported even with different drives and even when the drive in question was definitely a different one—like the SD card in the card-reader).


But what is the D?


It definitely isn’t a partition. Physical problems affect the whole drive, not a single volume, plus the System\Disk event log entries logs physical problems; filesystem issues are logged to Application\Winlogon.


So what does the D refer to? Has anyone ever seen a different letter? Googling for \Device\Harddisk0\C returns a small handful of results which are most likely just a typos. I managed to find one person who asked this question but got no answer.

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