Device Configuration Overlay was introduced in ATA-6 to allow hiding of disk capabilities. DCO allows user purchases drives from different vendors which have different storage space to appear offering same number of sectors.
DCO caused the IDENTIFY_DEVICE command to show a subsut of features and smaller disk size. DCO uses DEVICE_CONFIGURATION_SET command to reserve specified storage at end of the disk. The usable disk space could be further reduced by using HPA.
DCO is also managed via ATA commands like HPA.
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