Can I build RAC with just 2 machines, without external storage device?

Hi,
Version: 11gR2
I am trying to build Oracle RAC using 2 Linux machines, node 1 and node2. I have 2 ethernet cards in each node. I have setup Bind DNS server to node 1 successfully. Now, I am running Oracle Grid Infrastructure installation wizard. I have reached "Storage Option" screen. Here I have two options - (1) ASM (2) Shared File System.
If I choose ASM and go next, I see nothing of course, in the list of candidate Disks below. I guess here it is supposed to list up shared disk like SAN or NAS if I have. I can't afford these external HDD stuff and want to build RAC using just these two Linux machines.. Is it possible? Another question is, the difference between ASM and Shared File System. Does Shared File System mean NFS? I have a very old low-spec laptop and I may be able to install Linux, to make it NFS but if I do that, is it going to be option (2) - Shared File System? I am not feeling like building the 3rd machines for this..
Thanks
Kensho

Hi,
>> I can't afford these external HDD stuff and want to build RAC using just these two Linux machines
If you are installing on your laptop why dont you use vmware, please follow below link to install on laptop.
http://www.oracle-base.com/articles/11g/oracle-db-11gr2-rac-installation-on-ol5-using-vmware-server-2.php
>> Another question is, the difference between ASM and Shared File System
http://docs.oracle.com/cd/E11882_01/install.112/e24614/storage.htm

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Can I build RAC with just 2 machines, without external storage device?

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