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IO Meter
We compared the 4 TB Western Digital RE (WD4000FYYZ) to the 2 TB Western Digital RE4-GP, because that was the most recent RE-class drive we have in our library of drives. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
Throughput (Random Access)
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
29.76 MB/s |
17.19 MB/s |
+ 73.1% |
512 KB Write |
46.65 MB/s |
42.36 MB/s |
+ 10.1% |
4 KB Read |
0.33 MB/s |
0.28 MB/s |
+ 17.9% |
4 KB Write |
0.83 MB/s |
0.69 MB/s |
+ 20.3% |
The small random reads and writes are the most important tests for applications that make a lot of random accesses, so those would be key performance indicators for the 4 TB Western Digital RE.
Random Access Time
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
17.62 ms |
29.07 ms |
- 39.4% |
512 KB Write |
11.24 ms |
11.80 ms |
- 4.7% |
4 KB Read |
12.42 ms |
13.91 ms |
- 10.7% |
4 KB Write |
4.92 ms |
5.65 ms |
- 12.9% |
CPU Utilization (Random Access)
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
0.22% |
0.22% |
- |
512 KB Write |
0.41% |
0.21% |
+ 95.2% |
4 KB Read |
1.07% |
0.05% |
+ 2040% |
4 KB Write |
0.33% |
0.15% |
+ 120.0% |
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• The 4 TB Western Digital RE |
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• Peeking Under The PCB |
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• Better Reliability Through Technology |
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6 |
• Testing The 4 TB Western Digital RE |
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