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WDWD121KRYZ
Group Average(9 Highest-Voted)
▲ 5378 ▼

Release date ≈ Q4 2017.

VS
Effective Speed 
+28%
Real World Speed
Performance profile from 1,221 user samples
Benchmark your HDD here
1,221 User Benchmarks
Best Bench: 138% 11TB free
Worst Bench: 72% 11TB free
Poor: 72% Great: 138%
SPEED RANK: 1st / 1015
Effective Speed
Effective HDD Speed 		113 % Faster effective speed.
+28% 		87.8 %
Average Score 
+60%
Read
Avg. Sequential Read Speed 		197 MB/s Faster read speed.
+27% 		155 MB/s
Write
Avg. Sequential Write Speed 		197 MB/s Much faster write speed.
+44% 		136 MB/s
4K Read
Avg. 4K Random Read Speed 		1.58 MB/s Hugely faster random read.
+85% 		0.86 MB/s
4K Write
Avg. 4K Random Write Speed 		5.22 MB/s Hugely faster random write.
+163% 		1.99 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		96.1 MB/s Faster mixed IO speed.
+21% 		79.2 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		1.28 MB/s Much faster random mixed IO.
+53% 		0.83 MB/s
SusWrite
Avg. Sustained Write Speed 		194 MB/s Faster sustained write speed.
+29% 		150 MB/s
Peak Score 
+71%
Read
Peak Sequential Read Speed 		241 MB/s Faster peak read speed.
+21% 		199 MB/s
Write
Peak Sequential Write Speed 		243 MB/s Much faster peak write speed.
+35% 		180 MB/s
4K Read
Peak 4K Random Read Speed 		2.96 MB/s Hugely faster peak random read.
+186% 		1.03 MB/s
4K Write
Peak 4K Random Write Speed 		5.97 MB/s Hugely faster peak random write.
+142% 		2.47 MB/s
Mixed
Peak Sequential Mixed IO Speed 		121 MB/s Faster peak mixed IO speed.
+29% 		93.6 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		1.6 MB/s Much faster peak random mixed IO.
+60% 		1 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		242 MB/s Faster peak sustained write speed.
+24% 		195 MB/s
Value & Sentiment 
+8,743%
Market Share
Based on 53,961,347 HDDs tested
See market share leaders
User Rating
UBM User Rating 		53 % 59.6 % More popular.
+12%
Market Share
Market Share (trailing 30 days) 		0.01 % 3.48 % Insanely higher market share.
+34,689%
Price
Price (score) 		$289 64.8 USD Hugely cheaper.
+346%
Value
Value For Money 		93.6 % Much better value.
+74% 		53.7 %
Nice To Haves 
+50%
Age
Newest 		83+ Months Much more recent.
+50% 		125 Months
Specifications 
Capacity
Capacity 		12TB   —
Conclusion 
Average Bench 113%

The fastest and highest capacity HDD in the market currently. Liked that naming scheme but most users aren't going to see advantages of very high capacity HDD as this HDD is intended for storing huge amount of data and is very pricey. [Feb '20 ColdSpy]

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1,221
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Hard Drive Rankings (Price vs Performance) November 2024 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.
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Welcome to our PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best value for money upgrades.

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 Frequently Asked Questions

Storage Devices FAQ
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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?
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The Best
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Intel Core i5-13600K $210Nvidia RTX 4060 $285WD Black SN850X M.2 2TB $130
Intel Core i5-12600K $160Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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