The 640GB Caviar Blue shares several specifications with the disappointing 500GB model, including a 16MB cache and 7,200rpm spindle speed – but the use of denser 320GB platters boosts performance.
Results of 90.5MB/sec in our file read test and 79.1MB/sec in the write test are far quicker than the 500GB Caviar Blue drive, and a burst speed of 221.9MB/sec is more than twice as fast as the 500GB drive. The average sequential read speed of 97.1MB/sec is better, too.
These results are encouraging, but they’re still disappointing when compared with rival disks. The 640GB Western Digital hovers around the middle of our results table, whereas the 640GB Seagate Barracuda 7200.11 is the fourth-quickest drive on test this month.
It’s cheaper than some of its rivals, but that isn’t enough to convince us of its merits. It’s by no means a bad drive, but the Blue is neither cheap enough nor fast enough to stand out in this company.
Specifications | |
|---|---|
| Capacity | 640GB |
| Hard disk usable capacity | 595GB |
| Hard disk type | Mechanical |
| Cache size | 16MB |
| Spindle speed | 7,200RPM |
| Seek time (ms) | 16ms |
| Cost per gigabyte | 8.4p |
Noise and power | |
| Idle power consumption | 8W |
Performance tests | |
| HD Tach burst speed | 221.9MB/sec |
| HD Tach random access speed | 16.1ms |
| HD Tach average sequential read speed | 97.1MB/sec |
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