Why not to place Oracle Datafiles on local disks

Hi, I want to ask a basic question.
Almost any Oracle installation I saw, the datafiles were placed on mount points, disks etc.
Is there a reason for this? Why does no one place oracle datafiles to local disks? I couldnt find the answer on installation guide's
I am asking this because I am going to install oracle (10g) on vmware and trying to decide whether or not to put datafiles on vmdk (local disk of virtual machine)...
Is this recommended? Or otherwise, why it is recommended to put datafiles to a mount point/external disk etc.
Thanks in advance

Hi,
Oracle is flexiable to place datafiles at your desired location. To reduce IO contention, It's adviced to place datafiles of particular database on specific folder.
For an instance, While you create database using DBCA, There will be an option asked to choose the datafile location.
Regards
KSG

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