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IO Meter
We compared the Western Digital WD30EURS to the Western Digital WD20EVDS. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
Throughput (Random Access)
Test |
WD30EURS (3 TB) |
WD20EVDS (2 TB) |
Difference |
512 KB Read |
15.27 MB/s |
15.86 MB/s |
- 3.7% |
512 KB Write |
18.22 MB/s |
33.10 MB/s |
- 45.0% |
4 KB Read |
0.21 MB/s |
0.23 MB/s |
- 8.7% |
4 KB Write |
0.21 MB/s |
0.49 MB/s |
- 57.1% |
These results show the weakness of the first-generation AFT hard disk drives. Due to the emulation mode used, they have markedly slower write speeds, particularly random writes. For more information on the performance effect of Advance Format Technology, take a look at this article.
Random Access Time
Test |
WD30EURS (3 TB) |
WD20EVDS (2 TB) |
Difference |
512 KB Read |
34.32 ms |
33.04 ms |
+ 3.9% |
512 KB Write |
28.73 ms |
15.83 ms |
+ 81.5% |
4 KB Read |
19.90 ms |
17.94 ms |
+ 10.9% |
4 KB Write |
19.53 ms |
8.31 ms |
+ 135.0% |
CPU Utilization (Random Access)
Test |
WD30EURS (3 TB) |
WD20EVDS (2 TB) |
Difference |
512 KB Read |
0.12% |
0.50% |
- 76.0% |
512 KB Write |
0.13% |
0.19% |
- 31.6% |
4 KB Read |
0.08% |
0.38% |
- 78.9% |
4 KB Write |
0.13% |
0.16% |
- 18.8% |
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• The 3 TB Western Digital AV-GP |
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• Testing The 3 TB Western Digital AV-GP |
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