VirtualDiskDevelopmentKit60Download
It describes the Virtual Disk data model, how to create and format disks, and how to read and write disk files. The guide describes how to manage disks in a virtual machine (VM), how to create/extend a disk, how to back up the disk, how to copy the disk to another device, how to extend the disk, how to grow the disk, how to defragment the disk, how to recover from disk corruption, and how to power off the disk.
The vSphere Storage APIs, – Data , allow you to extend, manage, manage, copy, backup, recover, and power off the disks in a VM. The  API enables you to use the Storage APIs for the disks in a VM. The  API provides the same commands as the Storage APIs but provides an HTTP-based API instead of an SSH or REST-based API.
The VDDK and  API allow you to extend a disk. You can use the VDDK to create, format, and extend a disk in a VM. The  API allows you to manage the disks in a VM.
Overview
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This guide describes the features of the VDDK, the features of the vSphere Storage APIs, the relationship between the VDDK and the  API, and the commands available in the VDDK.
VDDK overview
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The VMware® Virtual Disk Development Kit (VDDK) is a free, open source toolkit that enables you to create, format, and manage the virtual disks in VMs. You can use the VDDK to create, format, extend, copy, and back up the disks in a VM. This guide assumes that you have the VDDK.
The VDDK and the  API provide the same commands but use different methods to implement the commands. The VDDK uses Virtual Disk Manager (VDM), which is the graphical user interface (GUI) for managing virtual disks. The VDDK uses the file system of the VM to access the disk images (`vmdk` files). The  API uses the File API, which is the underlying file system in the VM, to access the disk images.
VDDK features
This section lists the features of the VDDK.
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