The INCITS T10 committee website is at http://www.t10.org/. Among the draft documents available at this website are excellent versions of the SCSI Architecture Model (SAM). A great deal of open-system storage operating theory can be derived by reading the SAM documents.
The following is a list of subject areas under development as T10 standards that have documents available on the T10 committee website:
SBC— SCSI Block Commands (disk drive commands)
RBC— Reduced Block Commands (simplified disk drive commands)
SSC— SCSI Stream Commands
SMC— SCSI Media Changer Commands
MMC— Multimedia Commands
SCC— SCSI Controller Commands
SES— SCSI Enclosure Services
OSD— Object-based Storage Devices ...