There are hundreds of forums across the internet with consumers pondering the difference between WD‘s array of colour-named drives. Currently, consumer offerings consist of the Black, Red, Blue and Green line, with each geared for slightly different usage scenarios.
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The Black drives are for the performance enthusiasts or those with money in the bank, while the Red drives are mainly used for network storage or reliable data retention in RAID arrays. The Blue drives are probably the closest to the bog-standard drive, and then come the WD Green drives.
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