8471.70.10.00 - Without read-write unit assembled therein; read-write units entered separately

This HTS classification, 8471.70.10.00, specifically covers magnetic disk drive units that are designed for disks with a diameter exceeding 21 centimeters, but *without* having a read-write unit assembled within them, or if the read-write units are entered separately. This designation applies to the core magnetic disk drive mechanism itself, excluding integrated read/write functionalities that would otherwise qualify for a different classification. Examples include the physical housing and mechanism for storing and spinning large-format magnetic disks, such as those found in legacy industrial or high-capacity archival systems.

This category is distinguished from its sibling categories by the explicit exclusion of assembled read-write units and the focus on disk diameters exceeding 21 cm. HTS code 8471.70.20.00, for instance, would cover units intended for physical integration into automatic data processing machines, implying a more complete, functional component. The category 8471.70.30.00 serves as a residual classification for other magnetic disk drive units not falling into the more specific categories. Therefore, 8471.70.10.00 isolates the structural and mechanical aspects of large-format magnetic disk drives where the read-write technology is either absent or handled as a separate import.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. The classification is granular enough to capture these specific types of magnetic disk drive components based on their physical characteristics (disk diameter) and the presence or absence of integral read-write functionality. Proper classification hinges on verifying that the unit meets the size requirement and that any read-write components are either not included or are declared separately.