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Master and slave clarification
Although they are in extremely common use, the terms "master" and "slave" do not actually appear in current versions of the ATA specifications. The two devices are simply referred to as "device 0" and "device 1", respectively, in ATA-2 and later.
This doesn't seem to be entirely correct. While most uses of the terms were changed to device 0/1 (compared to ATA-1) and in the drafts of ATA-2 and ATA-4, the following is stated:
3. Definitions, abbreviations, and conventions
3.1 Definitions and Abbreviations
For the purposes of this American National Standard, the following definitions apply.
...
3.1.11 Master: Previous to this standard, Device 0 has also been referred to as the master. Throughout this document the term Device 0 shall be used.
...
3.1.16 Slave: Previous to this standard, Device 1 has also been referred to as the slave. Throughout this document the term Device 1 shall be used.
3 Definitions, abbreviations, and conventions
3.1 Definitions and abbreviations
For the purposes of this American National Standard, the following definitions apply:
…
3.1.24 master: In ATA-1, Device 0 has also been referred to as the master. Throughout this document the term Device 0 is used.
…
3.1.34 slave: In ATA-1, Device 1 has also been referred to as the slave. Throughout this document the term Device 1 is used.
...in addition to appearing in those definitions themselves, the terms appear in:
While it's possible that the final ATA-4 specification (access to the document requires payment) removed all mentions, the fact that mentions were preserved between the ATA-2 and ATA-4 drafts makes it seem highly unlikely that they were absent from the ATA-2 final spec. —Undomelin (talk) 21:32, 15 November 2018 (UTC)