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WD WD6401AALS

Black 640GB (2008)

▲ 500 ▼

Release date ≤ Q4 2013.

VS

Average Bench: 50.5% (306th of 1015)

more Based on 11,124 user benchmarks.  Models: WDC WD6401AALS-00L3B2, WDC WD6401AALS-00L3B, WDC WD64 01AALS-00J7B, WDC WD64 01AALS-00E3A, WDC WD64 01AALS-00E8B0, WDC WD6401AALS-00E3A, WDC WD64 01AALS-00E3A0, WDC WD6401AALS-00E8B0, WDC WD6401AALS-00J7B, WDC WD64 01AALS-00E8B, WDC WD64 01AALS-00L3B2, WDC WD6401AALS-00E3A0, WDC WD6401AALS-00J7B1, WDC WD6401AALS-00E8B, WDC WD6401AALS-00J7B0, WDC WD64 01AALS-00J7B0, WDC WD6401AALS-0, WDC WD64 01AALS-00J7B1, WDC WD64 01AALS-00L3B
Poor: 35%Average: 50.5% Great: 63%

Popular builds with this HDD

Average average bench

The WD Black 640GB (2008) averaged 49.5% lower than the peak scores attained by the group leaders. This isn't a great result which indicates that there are much faster alternatives on the comparison list.

Strengths

Avg. 4K Random Mixed IO Speed 0.92MB/s
Avg. 4K Random Write Speed 2.11MB/s

Good consistency

The range of scores (95th - 5th percentile) for the WD Black 640GB (2008) is 28.3%. This is a relatively narrow range which indicates that the WD Black 640GB (2008) performs reasonably consistently under varying real world conditions.

Weaknesses

Avg. Sequential Mixed IO Speed 64.9MB/s
Avg. Sustained Write Speed 82.7MB/s
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Average Bench

(Based on 11,124 samples)
Rank 30650.5%
Min Avg Max
60.8 Read 92.9 115
50 Write 86.2 109
42.3 Mixed 64.9 81.5
47.5 SusWrite 82.7 108
60.2% 81.7 MB/s
Min Avg Max
0.6 4K Read 0.77 0.9
1.1 4K Write 2.11 2.7
0.7 4K Mixed 0.92 1.1
173% 1.27 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
595GB free
Firmware: 01.03B01
SusWrite @10s intervals: 110 109 110 111 111 111 MB/s
64.1% Good
Read 113
Write 109
Mixed 67
SusWrite 110
73% 99.8 MB/s
4K Read 0.8
4K Write 2
4K Mixed 1
182% 1.27 MB/s
582GB free
Firmware: 01.03B01
SusWrite @10s intervals: 111 110 112 111 112 107 MB/s
61.6% Good
Read 104
Write 100
Mixed 77.5
SusWrite 110
72% 98.1 MB/s
4K Read 0.9
4K Write 1.9
4K Mixed 0.9
173% 1.23 MB/s
531GB free
Firmware: 05.00K05
SusWrite @10s intervals: 103 103 103 102 101 102 MB/s
60.2% Good
Read 107
Write 98.5
Mixed 58.5
SusWrite 102
67% 91.6 MB/s
4K Read 0.8
4K Write 2.5
4K Mixed 0.9
180% 1.4 MB/s
412GB free
Firmware: 01.03B01
SusWrite @10s intervals: 97 97 96 97 98 99 MB/s
58.4% Above average
Read 106
Write 103
Mixed 81
SusWrite 97.2
72% 96.8 MB/s
4K Read 0.9
4K Write 2
4K Mixed 0.9
174% 1.27 MB/s
248GB free
Firmware: 01.03B01
SusWrite @10s intervals: 59 58 60 60 60 60 MB/s
47% Average
Read 104
Write 104
Mixed 79.4
SusWrite 59.7
64% 86.6 MB/s
4K Read 0.9
4K Write 2.2
4K Mixed 1
189% 1.37 MB/s
135GB free
Firmware: 05.00K05
SusWrite @10s intervals: 67 66 67 68 68 68 MB/s
40.8% Average
Read 74.5
Write 73.2
Mixed 55.6
SusWrite 67.2
50% 67.6 MB/s
4K Read 0.8
4K Write 2.2
4K Mixed 1
185% 1.33 MB/s
11,124 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 20,435,120 HDDs tested.

 Prices

AmazonUS $8012 months
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Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money.

CHOOSE A COMPONENT:

CPU GPU SSD HDD RAM MBD
Typical Black 640GB (2008) Builds (Compare 15,518 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 47%
Yacht
Desktop
Desktop 66%
Battle cruiser
Workstation
Workstation 35%
Sail boat

Motherboard: Asrock Z77 Extreme4 - $167

CPU
Core i5-3570KIntel  $179Bench 61%, 117,715 samples7,123x
Core i7-3770KIntel  $138Bench 64%, 84,583 samples2,945x
Core i7-3770Intel  $284Bench 60%, 134,392 samples1,315x
GPU
GTX 970Nvidia  $399Bench 50%, 481,930 samples1,604x
GTX 1070Nvidia  $300Bench 78%, 627,011 samples1,296x
GTX 1060-6GBNvidia  $250Bench 56%, 658,138 samples1,164x
SSD
850 Evo 250GBSamsung  $55Bench 105%, 476,799 samples1,043x
850 Evo 500GBSamsung  $107Bench 113%, 371,028 samples955x
860 Evo 500GBSamsung  $75Bench 109%, 185,892 samples363x
RAM
Vengeance DDR3 1600 C9 2x4GBCorsairBench 50%, 45,281 samples656x
Vengeance DDR3 1600 C9 4x4GBCorsairBench 54%, 18,803 samples358x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 55%, 21,155 samples320x
EDIT WITH CUSTOM PC BUILDER Value: 40% - Average Total price: $800

Popular Black 640GB (2008) compatible motherboards:

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Hard Drive Rankings (Price vs Performance) October 2019 HDD Rankings.

We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top HDDs. [HDrivePro]

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Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.

 Comments

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Speed Comparisons

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1015 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different HDDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

Storage Devices FAQ
What is sustained sequential write speed?
What’s the difference between SLC, MLC and TLC?
What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
What’s the difference between NAND and V-NAND?
What is sequential write speed?
What is sequential read speed?
What is incompressible data?
What is queue depth?
What is 4K random write speed?
What is 4K random read speed?
What is AS SSD real world copy speed?
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Hard Drives
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ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-9400F $140Nvidia GTX 1660 $220Samsung 850 Evo 250GB $55
Intel Core i5-9600K $225Nvidia GTX 1660-Ti $275Samsung 850 Evo 500GB $107
Intel Core i7-9700K $288Nvidia RTX 2060S (Super) $430Samsung 850 Pro 256GB $200
HDDRAMUSB
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $76SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $37G.SKILL Trident Z DDR4 3200 C14 4x16GB $603SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $83Corsair Vengeance LPX DDR4 3200 C16 2x8GB $83SanDisk Ultra Fit 32GB $14
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