IOCTL_STORAGE_GET_DEVICE_NUMBER_EX IOCTL (ntddstor.h)
Returns a STORAGE_DEVICE_NUMBER_EX structure that contains the FILE_DEVICE_XXX type, device number, device GUID, and, for a partitionable device, the partition number assigned to a device by the driver when the device is started. This request is usually issued by a fault-tolerant disk driver.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
The driver returns the STORAGE_DEVICE_NUMBER_EX data in the buffer at Irp->AssociatedIrp.SystemBuffer.
Output buffer length
Parameters.DeviceIoControl.OutputBufferLength in the I/O stack location indicates the size, in bytes, of the parameter buffer, which must be >= sizeof(STORAGE_DEVICE_NUMBER_EX).
Input / Output buffer
n/a
Input / Output buffer length
n/a
Status block
The Information field is set to the number of bytes returned. The Status field is set to STATUS_SUCCESS, or possibly to STATUS_INSUFFICIENT_RESOURCES.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 10 |
| Header | ntddstor.h (include Ntddstor.h) |