The Hitachi TravelStar 4K120 (HTS421210H9AT00) is a 2.5-inch laptop hard drive with 100GB capacity, 4200RPM spindle speed, and 8MB cache buffer. It uses a 44-pin ATA-7 interface for compatibility with legacy and portable computing systems from the mid-2000s era. Typical throughput reaches approximately 40-50 MB/s depending on data location. This drive suits archival storage, embedded systems, or replacement in older ThinkPad, Latitude, or similar business-class notebooks. The low RPM and compact form factor minimize heat and power draw relative to desktop drives of the period.
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