1970: Error Correction
With the introduction of the IBM 3330 Direct Access Storage Facility in 1970, the storage world was introduced to the concept of error correction, a technology which detect errors in data as it is being transmitted from a source to a receiver and corrects the error.
Error correction is a feature in all hard drives sold today.
The IBM 3330 was also the first hard drive to feature a track-following servo system and a voice-coil actuator, a big factor in improving response time, track density, and reliability.
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