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Leopard Technical Notes
Storage devices include disk drives, tape drives, RAID arrays, and Storage Area Network (SAN) file systems. Mac OS X handles storage devices using a stack of drivers, each of which supports some aspect of communication. Developers can use the BSD interface and the I/O Kit to access storage devices. Administrators can use Xsan to aggregate networks of storage devices and to configure 64-bit cluster file systems.

Essential information for developers manipulating file systems in Mac OS X.  
Storage Topics
View the complete Storage Technical Notes List.
Data storage devices, including those that mount file systems or are bootable.