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The ISO 14644-1 classification defines air purity by the maximum number of particles per cubic meter. In ISO 5, the air contains a maximum of 3,520 particles of 0.5 µm/m³. In ISO 7 (a common class in the industry), this figure rises to 352,000 particles — 100 times more. For hard drive data recovery, ISO 5 is the minimum requirement because the read head flies over the platters at only 7 nanometers.