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Storage is every media that is used to carry computer data. There is:

Direct Attached Storage

Storage that is attached directly to one computer:

Shared Storage

Storage that can be attached to more than one computer. The computer components asking for access to storage are called initiators, those granting access are called targets. Storage access can be file-oriented ("give me file /tmp/whatever") or block-oriented ("give me data block 4711 of disk 3"). The access media can be an ethernet with or without IP protocol or it can be a specially-designed storage area network (SAN).