Inget betygHGST Ultrastar 7K4000 Enterprise SAS HDD Review
- Throughput figures measured near the top of the group across all categories
- Strong sequential transfer speeds
- 2 million hour MTBF is class leading
- Competing SAS HDDs edged out the 7K4000 in latency standard deviation
Conclusion The HGST Ultrastar 7K4000 SAS HDD is an enterprise class drive that utilizes up to five platters to achieve 4TB of storage capacity. Spinning at 7,200RPM, the drive also features the reliability figures organizations involved in cloud and data center storage require (MTBF at 2.0M hours). The drive is also optimized to meet those application needs with its included advanced power management modes which offer 5 profiles such as low RPM idle to drive a lower TCO. The drive is rated at 10.9W for read/write activity, 6.2W for unload idle, and at less than 2W for sleep and standby modes. Looking at testing for the HGST Ultrastar 7K4000 SAS HDD, the drive performed well overall. In all testing (4k, 8k, 128k, file server and web server), the Ultrastar 7K4000 SAS produced consistent throughput which was often second in the group. While not blowing away the competition, the fact that the drive performed so consistently says quite a bit. Additionally, the same can be said about its average latency figures. On a less than positive note, the drive's standard deviation figures were generally at the bottom of the group. However, that doesn't necessarily reflect that the drive produced the peakiest latency. In fact, the Ultrastar 7K4000 SAS placed in the upper half of the group in max and average latency most of the time. These throughput and latency figures matched with the Ultrastar 7K4000 SAS's warranty and MTBF specs provide enterprises with a very capable drive.