Logon to the ESXI Server where the VM is stored using a product like putty.

Ensure the VM is turned off.

The following command lists the datastores:

"ls" is used to List subregions - used to list out files in  a directory.

1. ls /vmfs/volumes

2. ls /vmfs/volumes/ESX01\_Internal1/

3. ls /vmfs/volumes/ESX01\_Internal1/RDS2012/

3. "vmkfstools -k /vmfs/volumes/ESX01\_Internal1/RDS2012/RDS2012.vmdk"

As shown above use vmkfstools -k to convert a Lazy Zeroed disk to a Eagerly Zeroed disk.