I am playing around with VMWare and came across this scenario.
I created a VMWare in VMPlayer, then decided I wanted to go the VMWare Server route instead (I know it's deprecated, but it's free!). When I installed server and started it up, I tried to add my VM to the inventory. VMWare Server complained that the VM file was corrupt or newer than it (the Player is from the new suite of tools). So I decided to add a new VM, but when it came time to select the Virtual HD, I noticed the option "use an existing Virtual Disk", so I selected the unimportable VM's disk and things worked great.
I'm a little scared that there is some funkiness because the VM was created in a newer edition of player, but is hosted by VMWare Server. I decided to delete the un-importable folder (after seeing that the new VM had its own VM Drive file) and when I went to start the new VM, it complained about a missing file. So I took the deleted file out of the trash and put it back and everything works great.
Are these 2 VM's actually sharing a virtual drive? I added a file in one of the VM's, but not the other, and didn't see it, but I didn't power cycle the VM's. What is the "Use an existing Virtual Disk" for?
Also, I copied the new VM folder (in the windows explorer browser) and was able to import it to VMWare Server and it asked if I had copied the VM, as expected, and everything worked great. This also did NOT appear to share a Drive with the other VM's.
I am looking for some clarification on shared virtual drives.