Determine what physical hard drive a file is on?

How can I find the physical drive a file/direct开发者_开发百科ory is located on. I want to compare 2 files and if they are on two separate drives, then I can speed up the compare by reading both simultaneously.

Regards

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This may require P/Invoke.

Way to know if two partitions are in one physical hard disk without WMI?

From above link:

The Win32 function you'll need is called DeviceIoControl(). The API documentation can be found at http://msdn.microsoft.com/en-us/library/aa363216(VS.85).aspx. Call DeviceIoControl() with the control code IOCTL_STORAGE_GET_DEVICE_NUMBER and you'll get the physical disk drive for the given partition device handle. The device handle for the partition can be retrieved using CreateFile() API.

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Read both simultaneously regardless.

At worst it might be slightly slower (depends on the actual physical disk(s)).

At best it will be faster.