Average Bench: 50.3% (305th of 1015)

more Based on 14,885 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

Average average bench

The WD Black 640GB (2008) averaged 49.6% 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.


Avg. 4K Random Mixed IO Speed 0.9MB/s
Avg. 4K Random Write Speed 2.07MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the WD Black 640GB (2008) is 30.8%. This is a relatively narrow range which indicates that the WD Black 640GB (2008) performs reasonably consistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 64.9MB/s
Avg. Sustained Write Speed 84.2MB/s

Average Bench

(Based on 14,885 samples)
Min Avg Max
58.1 Read 90.9 114
53 Write 86.1 108
42.7 Mixed 64.9 81.7
44.9 SusWrite 84.2 111
60.2% 81.5 MB/s
Min Avg Max
0.5 4K Read 0.76 0.9
1 4K Write 2.07 2.6
0.6 4K Mixed 0.9 1.1
170% 1.24 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
263GB free
Firmware: 01.03B01
SusWrite @10s intervals: 90 94 94 93 94 73 MB/s
Read 114
Write 106
Mixed 73.5
SusWrite 89.8
71% 95.9 MB/s
4K Read 0.8
4K Write 1.9
4K Mixed 1
180% 1.23 MB/s
138GB free
Firmware: 01.03B01
SusWrite @10s intervals: 95 100 102 103 103 104 MB/s
Read 102
Write 98.6
Mixed 76.7
SusWrite 101
70% 94.7 MB/s
4K Read 0.8
4K Write 2.1
4K Mixed 1
183% 1.3 MB/s
243GB free
Firmware: 01.03B01
SusWrite @10s intervals: 86 89 89 90 91 91 MB/s
Read 94.2
Write 81.5
Mixed 63.8
SusWrite 89.3
61% 82.2 MB/s
4K Read 0.6
4K Write 2.1
4K Mixed 0.9
164% 1.2 MB/s
223GB free
Firmware: 01.0
SusWrite @10s intervals: 67 66 65 65 65 65 MB/s
Read 69.8
Write 68
Mixed 55
SusWrite 65.3
48% 64.5 MB/s
4K Read 0.7
4K Write 2.1
4K Mixed 0.9
168% 1.23 MB/s
14,885 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 38,273,849 HDDs tested.


AmazonUS $669 months
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Typical Black 640GB (2008) Builds (Compare 60,122 builds) See popular component choices, score breakdowns and rankings.
Gaming 106%
Desktop 94%
Nuclear submarine
Workstation 108%

Motherboard: Asus TUF GAMING X570-PLUS (WI-FI) - $186

EDIT WITH CUSTOM PC BUILDER Value: 70% - Very good Total price: $1,232

Popular Black 640GB (2008) compatible motherboards:

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Hard Drive Rankings (Price vs Performance) May 2021 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]


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.


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

 Best User Rated

The Best.
Intel Core i5-11400F $210Nvidia RTX 3060-Ti $400Crucial MX500 250GB $50
Intel Core i5-11600K $255Nvidia RTX 3070 $500Samsung 850 Evo 120GB $78
Intel Core i7-11700K $390Nvidia RTX 3080 $700Samsung 860 Evo 250GB $40
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $28Corsair Vengeance LPX DDR4 3000 C15 2x8GB $102SanDisk Extreme 32GB $28
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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