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Western Digital Purple Surveillance Storage 4TB HDD Review (Page 5)

Chris Ramseyer | Mar 26, 2014 at 09:35 pm CDT - 0 mins, 48 secs reading time for this page
Rating: 92%Manufacturer: Western Digital

Surveillance Test Tool

Version and / or Patch Used: 1.00

WD provided a test tool for measuring Command Competition Time (CCT). The tool shows the percent of commands completed in millisecond blocks of time. Ideally, you want all of your commands to complete in the least amount of time. Although we're showing both read and write tests on the chart, surveillance systems spend over 90 percent of the time writing data and less than 10 percent reading it back.

HD Tach - CCT 720P 8-Channels

Western Digital Purple Surveillance Storage 4TB HDD Review 54 | TweakTown.com

HD Tach - CCT 720P 16-Channels

Western Digital Purple Surveillance Storage 4TB HDD Review 55 | TweakTown.com

HD Tach - CCT 720P 32-Channels

Western Digital Purple Surveillance Storage 4TB HDD Review 56 | TweakTown.com

It isn't until we reach the final test with 32 channels that we see a significant change in the chart. The change comes in the read performance where the single drive shifts the CCT to the 20 to 40ms range. In all of the tests, 99 percent of the writes occur in the 0 to 5ms period.

Last updated: Nov 15, 2019 at 01:16 pm CST

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ABOUT THE AUTHOR - Chris Ramseyer

Chris Ramseyer started his career as a LAN Party organizer in Midwest USA. After working with several computer companies he was asked to join the team at The Adrenaline Vault by fellow Midwest LAN Party legend Sean Aikins. After a series of shake ups at AVault, Chris eventually took over as Editor-in-Chief before leaving to start Real World Entertainment. Look for Chris to bring his unique methods of testing Hard Disk Drives, Solid State Drives as well as RAID controller and NAS boxes to TweakTown as he looks to provide an accurate test bed to make your purchasing decisions easier.

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