Plesk exercises two different security policies towards Windows objects:
disk security and hosting security. The difference between the
policies is dictated by the different security requirements for hosted
content as opposed to the rest of the server disks. Both policies are
defined by security rules specified in corresponding Plesk security
metadata files. The disk security policy is defined by the disk security
metadata file and is applied to all server disks except for the contents
of the %plesk_vhosts% directory, where all hosted content is
located. For more information about the disk security metadata file, see
Disk Security Metadata File. All hosting directories are
governed by security policies defined by corresponding hosting security
metadata files. Hosting security metadata files are automatically
generated from hosting security metadata file templates. For more
information about security metadata file templates, see Hosting
Security Metadata File Templates.