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Interesting to see that kind of a difference between hitachi and western digital, given that WD owns HGST. Are hitachi drives marketed as higher reliability drives, or was the acquisition by WD simply too recent for the quality of the two brands to "equalize"?

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Backblaze's data shows that the number of errors is largely related to the age of the drive. Because the older drives are from before Hitachi was acquired by WD, it is going to take a few more years for the brands to equalize if they do combine the manufacturing of both lines.

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