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Lining up the competition
Over the following pages, we'll compare the NAS HDD 4TB's performance to that of a diverse collection of mechanical drives. You'll want to pay particular attention to how the NAS drive stacks up against the Desktop HDD.15. Also, keep your eye on the Red 4TB, which is WD's entry into the NAS-friendly market.

  Interface Cache Spindle speed Areal density
Hitachi Deskstar 7K3000 3TB 6Gbps 64MB 7,200 RPM 411 Gb/in²
Seagate Barracuda 3TB 6Gbps 64MB 7,200 RPM 625 Gb/in²
Seagate Desktop HDD.15 4TB 6Gbps 64MB 5,900 RPM 625 Gb/in²
Seagate Desktop SSHD 2TB 6Gbps 64MB 7,200 RPM 625 Gb/in²
Seagate NAS HDD 4TB 6Gbps 64MB 5,900 RPM 625 Gb/in²
WD Caviar Black 1TB 6Gbps 64MB 7,200 RPM 400 Gb/in²
WD Caviar Black 2TB 6Gbps 64MB 7,200 RPM 400 Gb/in²
WD Black 4TB 6Gbps 64MB 7,200 RPM NA
WD Red 3TB 6Gbps 64MB 5,400 RPM NA
WD Red 4TB 6Gbps 64MB 5,400 RPM NA
WD VelociRaptor VR200M 600GB 6Gbps 32MB 10,000 RPM NA
WD VelociRaptor 1TB 6Gbps 64MB 10,000 RPM NA

Although the NAS HDD doesn't compete directly with SSDs, we couldn't resist including a batch of the latest solid-state drives in the mix. The results from these drives will provide some valuable perspective on the performance differences between the NAS HDD and its mechanical peers.

  Cache Flash controller NAND
Crucial M500 240GB 256MB Marvell 88SS9187 20nm Micron sync MLC
Intel 335 Series 240GB NA SandForce SF-2281 20nm Intel sync MLC
OCZ Vector 256GB 512MB Indilinx Barefoot 3 25nm Intel sync MLC
Samsung 840 Series 250GB 512MB Samsung MDX 21nm Samsung Toggle TLC
Samsung 840 Pro 256GB 512MB Samsung MDX 21nm Samsung Toggle MLC
Seagate 600 SSD 240GB 256MB LAMD LM87800 19nm Toshiba Toggle MLC

These six drives nicely cover some of the more popular controller and NAND combinations for modern SSDs. We have representatives from the high end of the spectrum, the more affordable side, and multiple points in between. All the drives are in the 240-256GB range.

If you're a TR regular already familiar with our storage test system and methods, feel free to skip ahead to the performance results. Apart from minor tweaks to the table below, the rest of this page is copied lazily from previous reviews. But I've added one more money shot of the NAS HDD as a bonus. Thanks for not skipping to the conclusion!

Our test methods
We used the following system configuration for testing:

Processor Intel Core i5-2500K 3.3GHz
CPU cooler Thermaltake Frio
Motherboard Asus P8P67 Deluxe
Bios revision 1850
Platform hub Intel P67 Express
Platform drivers INF update
Memory size 8GB (2 DIMMs)
Memory type Corsair Vengeance DDR3 SDRAM at 1333MHz
Memory timings 9-9-9-24-1T
Audio Realtek ALC892 with 2.62 drivers
Graphics Asus EAH6670/DIS/1GD5 1GB with Catalyst 11.7 drivers
Hard drives Crucial M500 256GB with MU02 firmware
Intel 335 Series 240GB with 335s firmware
OCZ Vector 256GB with 10200000 firmware
Samsung 840 Series 250GB with DXT07B0Q firmware
Samsung 840 Pro Series 256GB with DXM04B0Q firmware
Hitachi Deskstar 7K3000 3TB with MKA0A580 firmware
Seagate Barracuda 3TB with CC47 firmware
Seagate Desktop HDD.15 4TB with B660 firmware
Seagate 600 SSD with B660 firmware
Seagate NAS HDD 4TB with SC43 firmware
Seagate Desktop SSHD 2TB with CC43 firmware
WD Caviar Black 1TB with 05.01D05 firmware
WD Caviar Black 2TB with 01.00101 firmware
WD Red 3TB with 80.00A80 firmware
WD Red 4TB with 80.00A80 firmware
WD VelociRaptor VR200M 600GB with 04.05G04 firmware
WD VelociRaptor 1TB with 04.06A00 firmware
WD Black 4TB with 01.01L01 firmware
Power supply Corsair Professional Series Gold AX650W
OS Windows 7 Ultimate x64

Thanks to Asus for providing the systems' motherboards and graphics cards, Intel for the CPUs, Corsair for the memory and PSUs, Thermaltake for the CPU coolers, and Western Digital for the Caviar Black 1TB system drives.

We used the following versions of our test applications:

Some further notes on our test methods:

  • To ensure consistent and repeatable results, the SSDs were secure-erased before almost every component of our test suite. Some of our tests then put the SSDs into a used state before the workload begins, which better exposes each drive's long-term performance characteristics. In other tests, like DriveBench and FileBench, we induce a used state before testing. In all cases, the SSDs were in the same state before each test, ensuring an even playing field. The performance of mechanical hard drives is much more consistent between factory fresh and used states, so we skipped wiping the HDDs before each test—mechanical drives take forever to secure erase.

  • We run all our tests at least three times and report the median of the results. We've found IOMeter performance can fall off with SSDs after the first couple of runs, so we use five runs for solid-state drives and throw out the first two.

  • Steps have been taken to ensure that Sandy Bridge's power-saving features don't taint any of our results. All of the CPU's low-power states have been disabled, effectively pegging the 2500K at 3.3GHz. Transitioning in and out of different power states can affect the performance of storage benchmarks, especially when dealing with short burst transfers.

The test systems' Windows desktop was set at 1280x1024 in 32-bit color at a 75Hz screen refresh rate. Most of the tests and methods we employed are publicly available and reproducible. If you have questions about our methods, hit our forums to talk with us about them.