FSCTL_QUERY_STORAGE_CLASSES IOCTL (winioctl.h)

Retrieves the storage tiers defined for a volume that supports data tiering.

To perform this operation, call the DeviceIoControl function with the following parameters.

BOOL DeviceIoControl(
  (HANDLE) hDevice,                 // handle to device
  FSCTL_QUERY_STORAGE_CLASSES,      // dwIoControlCode
  (LPDWORD) lpInBuffer,             // input buffer
  (DWORD) nInBufferSize,            // size of input buffer
  (LPDWORD) lpOutBuffer,            // output buffer
  (DWORD) nOutBufferSize,           // size of output buffer
  (LPDWORD) lpBytesReturned,        // number of bytes returned
  (LPOVERLAPPED) lpOverlapped       // OVERLAPPED structure
);

Requirements

Requirement	Value
Minimum supported client	None supported
Minimum supported server	Windows Server 2012 R2
Header	winioctl.h

See also

• DeviceIoControl