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
1.
SW#: 16160
Western Digital - Cavier Caviar RE 1.0TB 7200RPM SAS600 64MB
Western Digital RE (RAID Edition) - 1.0TB - 3.5" Hard Drive (WD1001FYYG), Optimized for use in 24/7 Servers & RAID Arrays, Serial Attached SCSI (SAS600), 7200RPM, 32MB Cache - (5Y)
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2.
SW#: 16161
Western Digital - Cavier Caviar RE 2.0TB 7200RPM SAS600 64MB
Western Digital RE (RAID Edition) - 2.0TB - 3.5" Hard Drive (WD2001FYYG), Optimized for use in 24/7 Servers & RAID Arrays, Serial Attached SCSI (SAS600), 7200RPM, 32MB Cache - (5Y)
$ 226 + tax (CDN)
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3.
SW#: 16162
Western Digital - Cavier Caviar RE 3.0TB 7200RPM SAS600 64MB
Western Digital RE (RAID Edition) - 3.0TB - 3.5" Hard Drive (WD3001FYYG), Optimized for use in 24/7 Servers & RAID Arrays, Serial Attached SCSI (SAS600), 7200RPM, 32MB Cache - (5Y)
$ 306 + tax (CDN)
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4.
SW#: 16163
Western Digital - Cavier Caviar RE 4.0TB 7200RPM SAS600 64MB
Western Digital RE (RAID Edition) - 4.0TB - 3.5" Hard Drive (WD4001FYYG), Optimized for use in 24/7 Servers & RAID Arrays, Serial Attached SCSI (SAS600), 7200RPM, 32MB Cache - (5Y)
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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).