When CBT is enabled the vmdk header version type goes from version 1 to version 3. Once it is disabled it goes from 3 to 2.
Some application have issues dealing with CBT and the different vmdk header version types. Below is partial output from the cat of the vm.vmdk file that has CBT enabled.
[root@vc-esx4-blad05 rkp1a]# cat rkp1a_1.vmdk
# Disk DescriptorFile
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