Systems and associated methods provide a level of indirection between multiple host computers and multiple data storage resources, such as removable media data storage devices. At least one of the hosts is not provided with direct access to some of the removable media data storage devices. Instead, logical addresses are provided to the host computers, where the logical addresses can relate to physical addresses associated with the data storage resources. A data storage resource handle or logical proxy may be presented to a host, and a management layer determines whether the host receives access to physical data storage resources, or virtual resources that emulate the physical resources.

 
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> Magnetic head for perpendicular magnetic recording with controlled state of magnetization of the end face of the pole layer

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