How to differ between external HDD and internal ones?

I want to know whether device is connected via USB (meaning it is a removable hard drive) or SATA (meaning it is an internal hard drive). That is how I get a list of devices

SP_DEVINFO_DATA volumeData;
volumeData.cbSize = sizeof (SP_DEVINFO_DATA);
SP_DEVICE_INTERFACE_DATA volumeInterfaceData;
volumeInterfaceData.cbSize = sizeof (SP_DEVICE_INTERFACE_DATA);
wchar_t buffer[1024];
PSP_DEVICE_INTERFACE_DETAIL_DATA volumeInterfaceDetail;
volumeInterfaceDetail = (PSP_DEVICE_INTERFACE_DETAIL_DATA)buffer;
volumeInterfaceDetail->cbSize = sizeof (SP_DEVICE_INTERFACE_DETAIL_DATA);
for (int j = 0; SetupDiEnumDeviceInterfaces (hVolumeInfo, 0, &GUID_DEVINTERFACE_VOLUME, j, &volumeInterfaceData); j++) {
    DWORD bufferPathSize = offsetof (SP_DEVICE_INTERFACE_DETAIL_DATA, DevicePath) + sizeof(TCHAR);
    SetupDiGetDeviceInterfaceDetail (
        hVolumeInfo,
        &volumeInterfaceData,
        volumeInterfaceDetail,
        bufferPathSize,
        &bufferPathSize,
        &volumeData
        ));
    <some actions here>
}

After such operations I get a kind of the following result for each connected volume:

volumeInterfaceDetail->DevicePath: "\\\\?\\storage#volume#{3ec3ba03-2789-11e4-8251-806e6f6e6963}#0000000015f00000#{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}"

How can I detect an interface (USB, SATA) with which the considering device is connected? Or is there any other way to differ external and internal HDDs using WinAPI?

Solution

You need to do the following:

Use CreateFile to get a handle on to the device.
Use DeviceIoControl to send an IOCTL_STORAGE_QUERY_PROPERTY ioctl to the device to ask it to tell you its properties.
The resulting STORAGE_DEVICE_DESCRIPTOR structure contains a BusType enumeration that tells you the bus to which it is attached.

There's a small code snippet at the bottom of this page that you can use to get started.