TotalSize Property

DriveInfo.TotalSize Property


Gets the total size of storage space on a drive, in bytes.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

public long TotalSize { get; }

Property Value

Type: System.Int64

The total size of the drive, in bytes.

Exception Condition

Access to the drive information is denied.


The drive is not mapped or does not exist.


An I/O error occurred (for example, a disk error or a drive was not ready).

This property indicates the total size of the drive in bytes, not just what is available to the current user.

The following code example demonstrates the use of the DriveInfo class to display information about all of the drives on the current system.

using System;
using System.IO;

class Test
    public static void Main()
        DriveInfo[] allDrives = DriveInfo.GetDrives();

        foreach (DriveInfo d in allDrives)
            Console.WriteLine("Drive {0}", d.Name);
            Console.WriteLine("  Drive type: {0}", d.DriveType);
            if (d.IsReady == true)
                Console.WriteLine("  Volume label: {0}", d.VolumeLabel);
                Console.WriteLine("  File system: {0}", d.DriveFormat);
                    "  Available space to current user:{0, 15} bytes", 

                    "  Total available space:          {0, 15} bytes",

                    "  Total size of drive:            {0, 15} bytes ",
This code produces output similar to the following:

Drive A:\
  Drive type: Removable
Drive C:\
  Drive type: Fixed
  Volume label: 
  File system: FAT32
  Available space to current user:     4770430976 bytes
  Total available space:               4770430976 bytes
  Total size of drive:                10731683840 bytes 
Drive D:\
  Drive type: Fixed
  Volume label: 
  File system: NTFS
  Available space to current user:    15114977280 bytes
  Total available space:              15114977280 bytes
  Total size of drive:                25958948864 bytes 
Drive E:\
  Drive type: CDRom

The actual output of this code will vary based on machine and the permissions
granted to the user executing it.

.NET Framework
Available since 2.0
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