获取磁盘大小正确 [英] Getting Disk Size Properly

问题描述

我想获得一个连接的USB闪存驱动器的物理设备大小。我一直在使用WMI尝试。

I am trying to get the physical device size of a connected USB flash drive. I have tried using WMI.

        ManagementObjectSearcher mosDisks = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE Model = '" + cmbHdd.SelectedItem + "'");
        foreach (ManagementObject moDisk in mosDisks.Get())
        {
            lblCapacity.Text = "Capacity: " + moDisk["Size"];
        }

我一直在使用进口来获取几何尝试：

I have tried using imports to get the geometry:

        var geo = new DiskGeometry();
        uint returnedBytes;
        DeviceIoControl(Handle, 0x70000, IntPtr.Zero, 0, ref geo, (uint)Marshal.SizeOf(typeof(DiskGeometry)), out returnedBytes, IntPtr.Zero);
        return geo.DiskSize;

他们都做返回一个值..但它是不正确的。

They all do return a value.. but it is not correct.

例如，上面的代码返回250056737280.
当我转储整个二进制内容到一个新的文件，FileStream.Length返回250059350015

For example, the above code returns 250056737280. When I dump the entire binary contents to a new file, FileStream.Length returns 250059350015

见的最后一个选项是如何做大？这也是corrrect大小，我需要获得预期我的代码工作。但我不能转储数据的250GB只是为了获得全尺寸。 ？
那么，有没有其他方法来获得合适的尺寸

See how the last option is bigger? That is also the corrrect size I need to get for my code to work as expected. But I cannot dump 250gb of data just to get the full size. So is there another method to get proper size?

推荐答案

您可能会考虑尝试的 IOCTL_DISK_GET_LENGTH_INFO ，提供DevideIoControl。

You might consider trying IOCTL_DISK_GET_LENGTH_INFO with DevideIoControl.

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