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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 (Sequential Access)
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
171.34 MB/s |
108.76 MB/s |
+ 57.5% |
512 KB Write |
171.51 MB/s |
108.79 MB/s |
+ 57.7% |
4 KB Read |
54.57 MB/s |
53.99 MB/s |
+ 1.1% |
4 KB Write |
55.43 MB/s |
43.70 MB/s |
+ 26.8% |
Thanks to its much higher areal density and faster spindle speed, the new 4 TB Western Digital RE boasts a much higher sequential transfer rate for large reads and writes. However, that performance advantage was greatly reduced when it came to small writes, and completely eliminated for small sequential reads.
Sequential Access Time
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
3.06 ms |
4.60 ms |
- 33.5% |
512 KB Write |
3.06 ms |
4.59 ms |
- 33.3% |
4 KB Read |
0.07 ms |
0.07 ms |
- |
4 KB Write |
0.07 ms |
0.09 ms |
- 22.2% |
CPU Utilization (Sequential Access)
Test |
WD RE (4 TB) |
WD RE4-GP (2 TB) |
Difference |
512 KB Read |
0.67% |
0.42% |
+ 59.5% |
512 KB Write |
1.08% |
0.35% |
+ 208.6% |
4 KB Read |
8.22% |
6.72% |
+ 22.3% |
4 KB Write |
8.76% |
4.87% |
+ 79.9% |
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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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