Converter should not reformat the disk at all, it supports NT4 with SP6a. You can also move the VM files using the SCP command or using FastSCP or WinSCP to copy the files. You can also use vmkfstools to clone the disk file from one VMFS volume to another on the same server providing it can see both datastores.
1) Unregister the VM from the ESX host.
2) From the Service Console: vmkfstools -i \vmfs\volumes\oldVMFS\myVM\disk.vmdk \vmfs\volumes\newVMFS\myVM\disk.vmdk
3) Create a new VM and tell it to use an existing disk.
4) Power on the VM, make sure it works then delete the files from the old datastore.
Eric Siebert
VMware Communities User Moderator
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