Model Brand Seagate Series Barracuda 7200.7 Model ST3120827AS Packaging Bare Drive Performance Interface SATA 1.5Gb/s Capacity 120GB RPM 7200 RPM Cache 8MB Average Seek Time 8.5ms Average Latency 4.16ms Physical Spec Form Factor 3.5" Features Features SATA interface with NCQ 350 Gs non-op shock 3D Defense System Manufacturer Warranty Parts 5 years limited Labor 5 years limited

Model Brand Seagate Series Barracuda 7200.11 Model ST3160813AS Packaging Bare Drive Performance Interface SATA 3.0Gb/s Capacity 160GB RPM 7200 RPM Cache 8MB Average Latency 4.16ms Physical Spec Form Factor 3.5"

Western Digital 160 GB

Western Digital 80 GB IDE Internal PC Hard Drive

Western Digital My Book Essential WDG1U5000N 500GB 7200 RPM USB 2.0 External Hard Drive

Model Brand Western Digital Series Caviar RE Model WD2500SD Packaging Bare Drive Performance Interface SATA 1.5Gb/s Capacity 250GB RPM 7200 RPM Cache 8MB Average Seek Time 8.9ms Average Write Time 10.9ms Average Latency 4.2ms Physical Spec Form Factor 3.5" Features Features RAID-specific time-limited error recovery improves compatibility with RAID adapters, and prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop hard drives. 1,000,000 hours MTBF meets enterprise-class reliability standards.