Hi Gents,
I have been experiencing similar problems. I have a MBP (mid 2012) 8GB DDR3 (4 to Win7 Home Premium Guest OS) running Parallels 8 for Mac (most recent update).
We use the VM to run SolidWorks (the reliability of Macs finally pushed us away from using PC's). If you aren't familiar with the program, it is a 3D modeling program which is extremely comprehensive and can use quite a bit of computer resources. SolidWorks has about 30 different kinds of files (some used much more often than others, some never used for our purposes), and what we are doing is setting the default file locations for all of these files to look at our server (which is a Mac Mini running the latest Mac Server software).
We have had some problems with mapping drive letters. Parallels assigns shared drive letters beginning from the end of the alphabet, in the order that they are connected. We have gotten around the major issues by disabling smart mount, setting our custom shared folders (in the parallels settings panel) and coupling that with a startup Automator program that runs on startup (on the Mac side). This program connects to the server and then connects to each folder in order. The order that the startup program connects to the folders is the same order that I added the custom share folders on the parallels side, and this has seemed to work decently for keeping the same drive letters upon startup, so the links within SolidWorks are not broken and it can find the files in their designated location.
This, however, does not let me choose what to name the drives. I cannot find a way to tell parallels that pdf://Drawings should ALWAYS be drive "Y" in the windows guest OS. If there is a USB drive plugged into the computer when parallels starts up, It will shift the assigned drive letters up by a letter and break all pre-established file directories in Solidworks.
Is anybody else experiencing this same problem?
Thanks,
J_Semp