I think you cannot on workstation.
You can have MSCS on Vmware Server.
If you mean with quorum disk simply an additional virtual disk and use that as shared disk : no
BUT there are options. You can create a small virtual SAN .. there are solutions out there such as url=http://www.openfiler.com/Open filer[/url] which is an opensource iSCSI target based on Linux. Then all you need is installing the url=http://www.microsoft.com/downloads/details.aspx?familyid=12cb3c1a-15d6-4585-b385-befd1319f825&displaylang=eniSCSI initiator from Microsoft[/url] and you are ready to go.
Moved to workstation forum.
Edward L. Haletky
VMware Communities User Moderator
Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.
CIO Virtualization Blog: http://www.cio.com/blog/index/topic/168354
As well as the Virtualization Wiki at http://www.astroarch.com/wiki/index.php/Virtualization