c++ - 在 Windows 中检测 SSD

Question

我想根据系统驱动器是否为 SSD 来更改我的 C++ 应用程序的性能和行为。示例:

• 使用 SSD，我希望我的游戏服务器应用程序能够完全加载每个 map 和所有对象，以最大限度地提高性能。
• 使用 HDD，我希望我的游戏服务器应用程序仅加载每个 map 中的基本对象和实体，而不加载外部对象。

我见过 http://msdn.microsoft.com/en-gb/library/windows/desktop/aa364939(v=vs.85).aspx ，这是一种判断某个驱动器是否是HDD、CD ROM、DVD ROM、Removable Media等的方法，但它仍然无法检测到主系统驱动器是否是SSD。我也看过Is there any way of detecting if a drive is a SSD? ，但该解决方案仅适用于 Linux。

我认为我可以以某种方式生成一个大罚款 (500MB)，然后计算写入文件所需的时间，但是其他系统变量很容易影响结果。

在 Windows 中，使用 C++，有什么方法可以获取主系统驱动器是否为 SSD？

Answer 1

在完成一些研究并使用此页面上的答案信息后，这是我在 Windows 7 及更高版本中使用 C WinAPI 的实现:

//Open drive as such: "\\?\PhysicalDriveX" where X is the drive number
//INFO: To get drive number from a logical drive letter, check this method:
//      (But keep in mind that a single logical drive, or a volume,
//       can span across several physical drives, as a "spanned volume.")
//       http://stackoverflow.com/a/11683906/843732

#include <WinIoCtl.h>
#include <Ntddscsi.h>

DWORD bytesReturned;

//As an example, let's test 1st physical drive
HANDLE hDevice = ::CreateFile(L"\\\\?\\PhysicalDrive0",
    GENERIC_READ | GENERIC_WRITE,       //We need write access to send ATA command to read RPMs
    FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
    OPEN_EXISTING,  0, NULL);
if(hDevice != INVALID_HANDLE_VALUE)
{
    //Check TRIM -- should be Y for SSD
    _tprintf(L"TRIM=");

    STORAGE_PROPERTY_QUERY spqTrim;
    spqTrim.PropertyId = (STORAGE_PROPERTY_ID)StorageDeviceTrimProperty;
    spqTrim.QueryType = PropertyStandardQuery;

    bytesReturned = 0;
    DEVICE_TRIM_DESCRIPTOR dtd = {0};
    if(::DeviceIoControl(hDevice, IOCTL_STORAGE_QUERY_PROPERTY,
        &spqTrim, sizeof(spqTrim), &dtd, sizeof(dtd), &bytesReturned, NULL) &&
        bytesReturned == sizeof(dtd))
    {
        //Got it
        _tprintf(L"%s", dtd.TrimEnabled ? L"Y" : L"N");
    }
    else
    {
        //Failed
        int err = ::GetLastError();
        _tprintf(L"?");
    }


    //Check the seek-penalty value -- should be N for SSD
    _tprintf(L", seekPenalty=");

    STORAGE_PROPERTY_QUERY spqSeekP;
    spqSeekP.PropertyId = (STORAGE_PROPERTY_ID)StorageDeviceSeekPenaltyProperty;
    spqSeekP.QueryType = PropertyStandardQuery;

    bytesReturned = 0;
    DEVICE_SEEK_PENALTY_DESCRIPTOR dspd = {0};
    if(::DeviceIoControl(hDevice, IOCTL_STORAGE_QUERY_PROPERTY,
        &spqSeekP, sizeof(spqSeekP), &dspd, sizeof(dspd), &bytesReturned, NULL) &&
        bytesReturned == sizeof(dspd))
    {
        //Got it
        _tprintf(L"%s", dspd.IncursSeekPenalty ? L"Y" : L"N");
    }
    else
    {
        //Failed
        int err = ::GetLastError();
        _tprintf(L"?");
    }


    //Get drive's RPMs reading -- should be 1 for SSD
    //CODE SOURCE: https://emoacht.wordpress.com/2012/11/06/csharp-ssd/
    _tprintf(L", RPM=");

    ATAIdentifyDeviceQuery id_query;
    memset(&id_query, 0, sizeof(id_query));

    id_query.header.Length = sizeof(id_query.header);
    id_query.header.AtaFlags = ATA_FLAGS_DATA_IN;
    id_query.header.DataTransferLength = sizeof(id_query.data);
    id_query.header.TimeOutValue = 5;   //Timeout in seconds
    id_query.header.DataBufferOffset = offsetof(ATAIdentifyDeviceQuery, data[0]);
    id_query.header.CurrentTaskFile[6] = 0xec; // ATA IDENTIFY DEVICE

    bytesReturned = 0;
    if(::DeviceIoControl(hDevice, IOCTL_ATA_PASS_THROUGH,
        &id_query, sizeof(id_query), &id_query, sizeof(id_query), &bytesReturned, NULL) &&
        bytesReturned == sizeof(id_query))
    {
        //Got it

        //Index of nominal media rotation rate
        //SOURCE: http://www.t13.org/documents/UploadedDocuments/docs2009/d2015r1a-ATAATAPI_Command_Set_-_2_ACS-2.pdf
        //          7.18.7.81 Word 217
        //QUOTE: Word 217 indicates the nominal media rotation rate of the device and is defined in table:
        //          Value           Description
        //          --------------------------------
        //          0000h           Rate not reported
        //          0001h           Non-rotating media (e.g., solid state device)
        //          0002h-0400h     Reserved
        //          0401h-FFFEh     Nominal media rotation rate in rotations per minute (rpm)
        //                                  (e.g., 7 200 rpm = 1C20h)
        //          FFFFh           Reserved
        #define kNominalMediaRotRateWordIndex 217
        _tprintf(L"%d", (UINT)id_query.data[kNominalMediaRotRateWordIndex]);
    }
    else
    {
        //Failed
        int err = ::GetLastError();
        _tprintf(L"?");
    }


    _tprintf(L"\n");
    ::CloseHandle(hDevice);
}

如果您没有包含驱动程序 DDK，这里有一些定义:

#ifndef StorageDeviceTrimProperty
#define StorageDeviceTrimProperty 8
#endif

#ifndef DEVICE_TRIM_DESCRIPTOR
typedef struct _DEVICE_TRIM_DESCRIPTOR {
  DWORD   Version;
  DWORD   Size;
  BOOLEAN TrimEnabled;
} DEVICE_TRIM_DESCRIPTOR, *PDEVICE_TRIM_DESCRIPTOR;
#endif


#ifndef StorageDeviceSeekPenaltyProperty
#define StorageDeviceSeekPenaltyProperty 7
#endif

#ifndef DEVICE_SEEK_PENALTY_DESCRIPTOR
typedef struct _DEVICE_SEEK_PENALTY_DESCRIPTOR {
  DWORD   Version;
  DWORD   Size;
  BOOLEAN IncursSeekPenalty;
} DEVICE_SEEK_PENALTY_DESCRIPTOR, *PDEVICE_SEEK_PENALTY_DESCRIPTOR;
#endif


struct ATAIdentifyDeviceQuery
{
    ATA_PASS_THROUGH_EX header;
    WORD data[256];
};

最后，我的测试结束。

我有几个通过 SATA 电缆连接的三星 SSD，以及一个使用 PCIe 插槽直接连接到逻辑板的 PCIe SSD 驱动器。我还有一个也通过 SATA 电缆连接的大型内部 Western Digital HDD(旋转驱动器)和几个外部旋转 HDD。

这是我为他们准备的:

Samsung SSD 256GB:     TRIM=Y, seekPenalty=N, RPM=1
Samsung SSD 500GB:     TRIM=Y, seekPenalty=N, RPM=1
PCIs SSD:              TRIM=Y, seekPenalty=?, RPM=0
Internal WD HDD:       TRIM=N, seekPenalty=?, RPM=0
External WD HDD:       TRIM=?, seekPenalty=?, RPM=?
External Cavalry HDD:  TRIM=?, seekPenalty=Y, RPM=?

如您所见，就我而言，唯一对所有 6 个驱动器都正确的参数是 TRIM。我并不是说你的情况也会如此。这只是我对我拥有的驱动器的发现。