Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO. The system uses the IDENTIFY_DEVICE command to determine the supported features of a given hard drive, but the DCO can report to this command that supported features are nonexistent or that the drive is smaller than it actually is. To determine the actual size and features of a disk, the DEVICE_CONFIGURATION_IDENTIFY command is used, and the output of this command can be compared to the output of IDENTIFY_DEVICE to see if a DCO is present on a given hard drive. Most major tools will remove
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| - Device configuration overlay (en)
- 장치 구성 오버레이 (ko)
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| - 장치 구성 오버레이(Device configuration overlay, DCO)는 하드 디스크의 기능을 제한시킨다. ATA-6에서 추가되었다. DCO를 사용하여 여러 사이즈로 제작된 HDD를 같은 섹터 수를 가지는 고정된 크기의 HDD로 구성이 가능하다. BIOS를 통해 확인이 불가능하며 특별한 ATA명령을 통해 접근이 가능하다. (ko)
- Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO. The system uses the IDENTIFY_DEVICE command to determine the supported features of a given hard drive, but the DCO can report to this command that supported features are nonexistent or that the drive is smaller than it actually is. To determine the actual size and features of a disk, the DEVICE_CONFIGURATION_IDENTIFY command is used, and the output of this command can be compared to the output of IDENTIFY_DEVICE to see if a DCO is present on a given hard drive. Most major tools will remove (en)
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| - Device configuration overlay (DCO) is a hidden area on many of today's hard disk drives (HDDs). Usually when information is stored in either the DCO or host protected area (HPA), it is not accessible by the BIOS (or UEFI), OS, or the user. However, certain tools can be used to modify the HPA or DCO. The system uses the IDENTIFY_DEVICE command to determine the supported features of a given hard drive, but the DCO can report to this command that supported features are nonexistent or that the drive is smaller than it actually is. To determine the actual size and features of a disk, the DEVICE_CONFIGURATION_IDENTIFY command is used, and the output of this command can be compared to the output of IDENTIFY_DEVICE to see if a DCO is present on a given hard drive. Most major tools will remove the DCO in order to fully image a hard drive, using the DEVICE_CONFIGURATION_RESET command. This permanently alters the disk, unlike with the host protected area (HPA), which can be temporarily removed for a power cycle. (en)
- 장치 구성 오버레이(Device configuration overlay, DCO)는 하드 디스크의 기능을 제한시킨다. ATA-6에서 추가되었다. DCO를 사용하여 여러 사이즈로 제작된 HDD를 같은 섹터 수를 가지는 고정된 크기의 HDD로 구성이 가능하다. BIOS를 통해 확인이 불가능하며 특별한 ATA명령을 통해 접근이 가능하다. (ko)
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