Various other computer units are classified as separate units if they don't make up part of a complete computer system.Base unitsBase units or "system boxes" should contain at least a central processing unit (CPU) and main memory. They're classified under subheading code 8471 50 00 90.
External drives:Central storage units like Redundant Array of Independent Disks (RAID) systems for networks can be magnetic disk, tape or optical drives. They're classified under subheading code 8471 70 20 90.RAID controllers without drives are classified under subheading code 8471 70 98 90.
External drives for use with a single computer are classified according to the drive type, as follows:optical drives like CD, DVD and MO are classified under subheading code 8471 70 30 90 whether they're read-only or read and write (CD drives can retrieve signals from CD-ROMs, audio CDs and photo CDs and include a jack for earphones, a volume control or a start/stop button)
hard disk drives, including removable disk drives and micro drives, are classified under subheading code 8471 70 50 90floppy drives, including super floppy, are classified under subheading code 8471 70 70 90tape drives are classified under subheading code 8471 70 80 90pen drives - portable USB memory devices - are classified under subheading code 8523 5110 00
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