如何用代码区分SSD和机械硬盘，诸大神求指点啊

一个小项目，需要区分SSD和机械硬盘，请教下在代码层次如何区分(不是使用检测软件).
求大神指点一二.

（1）ssd和机械硬盘的制造商截然不同，前者只有屈指可数的几家
（2）测试iops，两者相去甚远
（3）http://stackoverflow.com/questions/13726522/what-is-the-easiest-way-in-c-sharp-to-check-if-hard-disk-is-ssd-without-writing

谢谢。DeviceIoControl使用哪一控制码 可以获取硬盘制造商及硬盘的标识？找了许久还是一头雾水。

        正好公司使用的SSD型号中包含SSD字符串，获取SSD的型号之后通过查找子串的方式就可以区分SSD和HHD了。不过在获取SSD型号的时候颇费了写周折！！

 #include <tchar.h>
#include <windows.h>
#include <winioctl.h>

void Check(LPCTSTR file, LPCTSTR volPathWithLeadingPrefix)
{
    HANDLE hFile = CreateFile(
        volPathWithLeadingPrefix,
        FILE_READ_ATTRIBUTES,  // Just querying; don't mount
        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
        NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, NULL);
    STORAGE_PROPERTY_QUERY spq =
    { StorageDeviceProperty, PropertyStandardQuery };
    union
    {
        STORAGE_DEVICE_DESCRIPTOR StorageDeviceDescriptor;
        BYTE Data[1024];
    } output = {0};
    DWORD br;
    if (DeviceIoControl(
        hFile, IOCTL_STORAGE_QUERY_PROPERTY,
        &spq, sizeof(spq), &output, sizeof(output),
        &br, NULL))
    {
        STORAGE_DEVICE_DESCRIPTOR &sdd =
            output.StorageDeviceDescriptor;
        if (sdd.ProductIdOffset > 0)
        {
            LPCSTR productID = (LPCSTR)&((LPBYTE)&sdd)[sdd.ProductIdOffset];
            BOOL isSSD = strstr(productID, "SSD") != NULL;
            _tprintf(_T("\"%s\": %s\n"), file, isSSD ? _T("SSD") : _T("HDD"));
        }
        else { _ftprintf(stderr, _T("No product ID.")); }
    }
    else
    { _ftprintf(stderr, _T("Error %u querying storage.\n"), GetLastError()); }
}

int _tmain(int argc, TCHAR *argv[])
{
    for (int i = 1; i < argc; i++)
    {
        LPCTSTR file = argv[i];
        TCHAR volPath[MAX_PATH];
        if (GetVolumePathName(file, volPath, ARRAYSIZE(volPath)))
        {
            for (size_t cchVolPath = _tcslen(volPath);
                cchVolPath > 0 && volPath[cchVolPath - 1] == TEXT('\\');
                cchVolPath--)
            { volPath[cchVolPath - 1] = TEXT('\0'); }

            TCHAR volPathWithLeadingPrefix[ARRAYSIZE(volPath)];
            if (_sntprintf(
                volPathWithLeadingPrefix,
                ARRAYSIZE(volPathWithLeadingPrefix),
                volPath[0] == _T('\\') ? _T("%s") : _T("\\\\.\\%s"),
                volPath) < ARRAYSIZE(volPathWithLeadingPrefix))
            {
                Check(file, volPathWithLeadingPrefix);
            }
            else
            {
                SetLastError(ERROR_FILENAME_EXCED_RANGE);
                _ftprintf(stderr, _T("Path \"%s\" is too long.\n"), volPath);
            }
        }
        else
        {
            _ftprintf(
                stderr,
                _T("Error %u getting volume path.\n"),
                GetLastError());
        }
    }
}