What are the differences between the Western Digital Drives?

WD Caviar Green: Cool, quiet, eco-friendly
WD Caviar Red: Cool, quiet, designed for NAS and small RAID setups
WD Caviar Blue: Performance & reliability for everyday computing
WD Caviar Black: Maximum performance for power computing
WD RE4: Optimized for RAID configurations, enterprise-class reliability
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SW#: 16719
Western Digital - Cavier 3TB PURPLE SATA 6GB/S INTELLIPOWER 64MB 3.5IN
3TB PURPLE SATA 6GB/S INTELLIPOWER 64MB 3.5IN
$ 138 + tax (CDN)
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Please note that the listed prices are already cash discounted. This discount is applicable ONLY for payments by cash/Interac/certified cheque. Payments by credit card (MasterCard and VISA only) will lose the 2.5% special discount (non-discounted regular price).