creating virtual hard Drive

Question

how can I create Virtual Hard Drive (like Z:) that store it's files on physical hard drive (Like C:\Files).

Answer 1

Here is C# code to do this directly:

using System; using System.Text; using System.ComponentModel; using System.Runtime.InteropServices;  static class Subst {     public static void MapDrive(char letter, string path) {         if (!DefineDosDevice(0, devName(letter), path))             throw new Win32Exception();     }     public static void UnmapDrive(char letter) {         if (!DefineDosDevice(2, devName(letter), null))             throw new Win32Exception();     }     public static string GetDriveMapping(char letter) {         var sb = new StringBuilder(259);         if (QueryDosDevice(devName(letter), sb, sb.Capacity) == 0) {             // Return empty string if the drive is not mapped             int err = Marshal.GetLastWin32Error();             if (err == 2) return "";             throw new Win32Exception();         }         return sb.ToString().Substring(4);     }       private static string devName(char letter) {         return new string(char.ToUpper(letter), 1) + ":";     }     [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]     private static extern bool DefineDosDevice(int flags, string devname, string path);     [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]     private static extern int QueryDosDevice(string devname, StringBuilder buffer, int bufSize); } 

Sample usage:

        Subst.MapDrive('z', @"c:\temp");         Console.WriteLine(Subst.GetDriveMapping('z'));         Subst.UnmapDrive('z'); 

Answer 2

You can use subst command. Use System.Diagnostic.Process to run the subst.exe with desired parameters.

Here is the command syntax:

Syntax

Associates a path with a drive letter.

SUBST [drive1: [drive2:]path]  SUBST drive1: /D 

drive1: Specifies a virtual drive to which you want to assign a path.

[drive2:]path Specifies a physical drive and path you want to assign to a virtual drive.

/D Deletes a substituted (virtual) drive.

Type SUBST with no parameters to display a list of current virtual drives.list of current virtual drives.