Definitive 2TB HD Roundup: WD, Seagate, Samsung

ATTO Disk Benchmark

ATTO is a more straight-forward type of disk benchmark that measures transfers across a specific volume length. It measures raw transfer rates for both reads and writes and graphs them out in an easily interpreted chart. We chose 0.5KB through 8,192KB transfer sizes over a total max volume length of 256MB.

ATTO Disk Benchmark - Read/Write Performance
Version 2.46



 Samsung EcoGreen F3 2TB

 Seagate Barracuda LP 2TB




 Seagate Barracuda XT 2TB

 Seagate Constellation ES 2TB





 WD Caviar Black 1TB




 WD Caviar Black 2TB

 WD Caviar Green 2TB






Three HDDs exceeded write speeds of 140MB/Sec on our ATTO test: the WD RE4 2TB (144.3MB/Sec), Seagate Barracuda XT 2TB (143.8MB/Sec), and the Seagate Constellation ES 2TB (141.0MB/Sec). Both WD Caviar Black drives also showed strong write performance--the 2TB drive had a write speed of 138.1MB/Sec and the 1TB version saw 133.7MB/Sec. Two of the general-purpose HDDs also had decent write performance: The Samsung EcoGreen F3 2TB had a write speed of 126MB/Sec and the Seagate Barracuda LP wrote at 122.3MB/Sec.

For read speeds, a total of five drives managed speeds that exceeded 140MB/Sec: The WD RE4 2TB lead the pack at 155.8MB/Sec, followed by the WD Caviar Black 2TB (148.9MB/Sec), Seagate Barracuda XT 2TB (147.5MB/Sec), Seagate Constellation ES 2TB (145.1MB/Sec), and the WD Caviar Black 1TB (142.8MB/Sec). The top-performing general-purpose HDD was the Seagate Barracuda LP, with a write speed of 122.6MB/Sec.

Once again, the two 6Gb/Sec drives didn't see any significant performance benefit from their faster SATA interfaces. On the other hand, the 120GB OCZ Vertex Turbo 2.5-inch SSD had a lighting-fast write speed of 201.5MB/Sec and a zippy read speed of 271.7MB/Sec.

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