Increase Your VMware Virtual Hard Disk Size ( vmdk file )

Required Tools

VMWare Product : Working Virtual machine and Vmware Workstation (it will work with other vmware product such as GSX Server and VMware Server).
GParted LiveCD : Third-party utility to expand the size of a virtual disk.

Step # 1: Shutdown The Guest Operating System

Shutdown and poweroff Windows Vista.

Delete all your snapshots from snapshot manager by visting VM > Snapshot Manger. Since you are going to resize you virtual disk, these snapshots going to create a problem for you.

Backup your entire virtual machine. My VM is located at /share/vms/WindowsVista. So I made a backup:
# cp -arv /share/vms/WindowsVista /safe/path/to/vm/05062009/
OR
# rsync /share/vms/WindowsVista user@lan.nixcraft.net.in:/.dumps/vms/05062009/
Another option is you can clone your guest in VMware, if you want to keep the existing virtual machine configuration by visiting VM > Clone option.
Step # 2: Increase Your Virtual Machine's Disk Capacity

Open shell prompt and type the following command:
# /usr/bin/vmware-vdiskmanager -x {diskSize}GB yourvm.vmdk
If you are using Windows operating host system change directory to C:\Program Files\VMware\VMware Workstation or add this to your PATH settings. Click on Start > Run and type cmd to open Windows shell prompt:
vmware-vdiskmanager -x {diskSize}GB "c:\vm\yourvm.vmdk"
OR use full path as follows
C:\Program Files\VMware\VMware Workstation\vmware-vdiskmanager -x {diskSize}GB "c:\vm\yourvm.vmdk"
Example: Increase Size to 32GB

Linux host example:
# /usr/bin/vmware-vdiskmanager -x 32GB /share/vms/WindowsVista/vista.vmdk
Windows host example:
C:\Program Files\VMware\VMware Workstation\vmware-vdiskmanager -x 32GB "c:\vm\centos.vmdk"
Step # 3: Expand The Size Of a Virtual Disk

Now, disk size is increased but operating system will only show 16GB used and 16GB unused. To add new 16GB to C: (i.e. expand the size of a a virtual disk), use GParted. You will need to use a third-party utility such as GParted to resize the expanded partitions. The GParted application is the GNOME partition editor for creating, reorganizing, and deleting disk partitions. GParted is a live Linux based CD. Download latest version here or use wget command as follows:
$ cd /tmp
$ wget http://nchc.dl.sourceforge.net/sourceforge/gparted/gparted-live-0.4.5-2.iso

Start Vmware

Select your VM (such as Windows Vista). Click on VM menu > Select Properties > Select CD / DVD > Use ISO Image > Click on Browse > Select /tmp/gparted-live-0.4.5-2.iso > Ok > Save.
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