Overview
ISO/IEC 24739-1:2009 - Information technology - AT Attachment with Packet Interface - 7 - Part 1: Register delivered command set, logical register set (ATA/ATAPI-7 V1) - defines the register-level interface and the register-delivered command set used between host systems and storage devices. The standard provides a common AT Attachment (ATA/ATAPI) register model and command definitions to ensure interoperability among systems manufacturers, system integrators, software suppliers and suppliers of intelligent storage devices.
Key topics and technical requirements
This part of the ATA/ATAPI-7 family primarily specifies:
- Register delivered commands and the logical register set required for host–device communication (data, command, status, error, features, LBA and sector count registers).
- A comprehensive command set covering read/write, DMA, queued I/O, packet commands, SMART, security (password, erase, freeze), power management (idle, standby, advanced power management), and device configuration commands.
- Feature sets and extensions including 48-bit addressing, Host Protected Area (HPA), CompactFlash™ feature set, removable media notifications, streaming and logging features.
- Detailed I/O register descriptions and operational conventions for command delivery and sector addressing.
- Annexes with command summaries and programming considerations for large physical sector devices.
- Cross-references to parallel and serial interface requirements in ISO/IEC 24739-2 and ISO/IEC 24739-3 for physical, transport and link layers.
Practical applications and users
Who uses ISO/IEC 24739-1:
- Storage device manufacturers (HDD, SSD, hybrid, ATAPI devices) implementing ATA register behavior and command responses.
- Firmware and driver developers building ATA/ATAPI device firmware, OS storage drivers, or host adapter software.
- System integrators and OEMs ensuring interoperability of storage subsystems with host platforms.
- Test and compliance engineers validating device behavior (SMART, security, DMA, queued commands) against the standard.
- Software suppliers of diagnostic, monitoring and management tools that rely on standard ATA registers and commands.
Practical benefits:
- Ensures consistent host–device communication and backward compatibility.
- Enables reliable implementation of power management, security, SMART monitoring and large-sector support.
- Supports development of interoperable drivers, firmware and compliance test suites.
Related standards
- ISO/IEC 24739-2 - Parallel interface physical and electrical requirements (see document references)
- ISO/IEC 24739-3 - Serial interface layers and transport (SATA-related details)
- ATA/ATAPI-7 family - broader context for ATA command and transport specifications
Keywords: ISO/IEC 24739-1:2009, ATA/ATAPI-7, AT Attachment, register delivered command set, logical register set, storage device interface, ATA commands, SMART, HPA, DMA, 48-bit addressing.