From: Vitaliy Margolen
So all you need to do is to find where this information is stored on windows (it has to be somewhere in registry
It's an IOCTL, so it is passed to the disk driver on Windows. Although it is possible that the driver caches the info in the registry, I don't think that's very likely (and it would be driver-dependent). That doesn't mean that Wine can't store the info where it pleases (e.g. in the registry).
Ge van Geldorp.