hesela.devAccessible Max Address Configuration (AMAC)
Accessible Max Address Configuration is an optional ATA feature set for discovering a device's native maximum LBA and controlling its accessible maximum LBA.
In ACS-3 revision 5, GET reports the native maximum and SET controls the accessible maximum. Once excluded addresses become accessible again, their contents are indeterminate. [1]
In ACS-3 revision 5, a successful SET prevents another SET before power-on reset. FREEZE also blocks later SET requests until power-on reset, and hardware/software resets do not clear that freeze. A refusal alone does not prove an explicit FREEZE was issued. [1]
The native-maximum LBA boundary in Table 91 does not imply identical treatment of reallocated user data. The cited draft excludes it from normal erase and includes it in enhanced erase. [1]
Relations
- related
- Host Protected Area (HPA), Device Configuration Overlay (DCO), Serial ATA (SATA), Data sanitization, Secure erase
Limitations
- Increasing the accessible range does not guarantee recovery of earlier contents. [1]
Citations
- T13 ACS-3 draft 2161-D rev. 5 (28 October 2013), Table 6; sections 4.5 and 7.2; section 7.39 Table 91
- Seagate openSeaChest ATA Security Feature guide (last edited 11 February 2026), Security Erase
- Seagate openSeaChest maintainer clarification (7 January 2021), discussion 52: HPA/DCO versus AMAC erase scope