| (subclass HardDiskDrive ComputerComponent) | QoSontology.kif 76-76 | Hard disk drive is a subclass of computer component |
| (subclass HardDiskDrive DigitalDataStorageDevice) | QoSontology.kif 77-77 | Hard disk drive is a subclass of digital data storage device |
| (subclass HardDiskDrive DiskDrive) | ComputerInput.kif 762-762 | Hard disk drive is a subclass of disk drive |
| (subclass ExternalHardDiskDrive HardDiskDrive) | ComputerInput.kif 747-747 | External hard disk drive is a subclass of hard disk drive |
| (subclass CartridgeHardDiskDrive HardDiskDrive) | ComputerInput.kif 756-756 | Cartridge hard disk drive is a subclass of hard disk drive |
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