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New Mac Pro?

Or iMac 5K or iMac Pro?
Consult with Lloyd ASAP before buying!


System configuration for CPU, GPU, memory, SSD, backup, RAID, optimizing performance, workflow.
For YOUR optimal workflow

Avoid costly mistakes in throwing money at the problem for less performance and/or buying the wrong machine for your own needs!

Remote screen sharing available for RAID, software configuration, etc.

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HGST Ultrastar He8: Sample Variation

Last updated 2015-11-11 - Send Feedback
Related: hard drive, HGST, RAID, storage

Get HGST 8TB Ultrastar He8 Hard Drive at OWC.
Also utilized in the 32TB OWC Thunderbay 4 RAID-5 edition.

This page assesses sample variation using five brand-new samples.

Consumer hard drives tend to vary in speed by as much as 15%. Enterprise hard drives can be expected to perform at slightly loser peak transfer rates, but with more consistent performance and less sample-to-sample variation (for better RAID behavior).

In some cases, enterprise hard drives also tend to be the “cream of the crop”: consumer drives might in fact be the same build as enterprise drives, but did not make the “cut” for enterprise quality in some way. Whether this is true may vary by vendor and/or drive model.

Performance testing by DiskTester, part of diglloydTools.

Drives hosted in the OWC Thunderbay 4, formatted using SoftRAID 5.1b21.

Sample variation, 5 samples, peak transfer speed

DiskTester run-sequential used to test peak speed of empty drives, freshly erased. Throughput figures are real-world figures through the OS X file system.

Performance variation across the five samples is held to within 4% difference (range from 192 to 200 MB/sec = 4% variation). This is a tight spread; many consumer drives vary by as much as 10-15% between samples.

See also the peak performance vs transfer size page.

Sample variation, sustained transfer speed, 5 samples of HGST 8TB Ultrastar He8
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