How to read the data written to the virtual disk

I use the following VDDK function to read the Flash disk from VMware

http://bigchainring.kicks-ass.NET/functions/VixDiskLib_Read.html

But areas of complete disc playback, including empty spaces. I need to back up only the data written to the Flash disk. It is to save the backup disk space (for example if 126 instant KB is written in 40 GB of disk snapshot, then we read only 126 KB and not 40 GB drive). Please suggest the correct way to read the data written to the Flash disk as well as to reproduce the same virtual disk with the data.

VMware vSphere API queryChangedDiskAreas() can be used to obtain the data blocks in the virtual disk.

Steps to follow:

1. get the beaches of block of data (numbers) using queryChangedDiskAreas() API with '*' as argument.

2 read the data of the specific blocks by using VixDiskLib_Read()

3. write to another drive using VixDiskLib_Write()

Tags: VMware

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