How to get unallocated space info in a physical disk

Can anybody help, how to get unallocated space information in a disk usin开发者_JAVA技巧g C# ?

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If you want to know the total free space for a volume, you can use DriveInfo.AvailableFreeSpace.

http://msdn.microsoft.com/en-us/library/system.io.driveinfo.aspx

You can also use WMI to fetch information about partitions on the disk, using Win32_DiskPartition and Win32_DiskDrive:

Win32_DiskPartition: http://msdn.microsoft.com/en-us/library/aa394135%28VS.85%29.aspx
Win32_DiskDrive: http://msdn.microsoft.com/en-us/library/aa394132%28v=VS.85%29.aspx

You can use the DeviceID field to identify which partition is on which disk, then use the StartOffset and Size fields to build a map of where the parititions are on the physical disk. Then just use the data from Win32_DiskDrive to work out the whole disk size, and compute the remainder.

Here's an article on MSDN that should give you all the help you need in using WMI:
http://msdn.microsoft.com/en-us/library/ms257338.aspx

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Try with something like this:

using System.Linq;
using System.IO;
using System;
namespace DriveInfoExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // Check only for fixed drives
            foreach (var di in DriveInfo.GetDrives().Where(d=>d.DriveType == DriveType.Fixed))
            {
                Console.WriteLine("Free space on drive {0}\t{1} bytes", di.Name, di.AvailableFreeSpace);
            }
        }
    }
}