Add Storage Error Message Not Enough Disk Space Available Requires 1.5GB

[ihsystem]

I have a little odd situation, we shutdown one ESX node but saved its Drive with VMs, unfortunately e need to extract some data from one of the VM on this old disk.

I created a new ESX5 node and trying to Add Stoirage, it finds the Drive but when I continue to add it as an Storage I get an error message 85MB disk space left requires 1,.5GB,any suggestion?

I think if I get volume information and may be delete some file or even one of the VM which is not needed for sure but how to do it, what are the commands ?

Thanks

[ihsystem]

Disk shows 525 MB Available, I remember it used to show atleast 100+GB of available space before we retired the ESX Node but before retiring I think a SnapShot was also created but should not be 100GB VM size is 40GB and this was may be 4 or 5 SnapShot...but can not load DiskStore bcs of space issue.