Raw disk partitions can be assigned one of three access rights:
Warning: Improper configuration of partition access rights can result in disk corruption.
If a virtual machine attempts to read from or write to a disk partition marked no access, or to write to a read only partition, a pop-up dialog box asks you to approve or reject the operation. If you decide not to allow the read or write, the virtual machine terminates. If you are uncertain what access to assign to a partition, make it read only.
You can hide the type of read-only partitions from the virtual machine as well. >>More on hiding read only partitions
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