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Western Digital Purple Surveillance Storage 4TB HDD Review

By: Chris Ramseyer | HDDs in Storage | Posted: Mar 27, 2014 2:35 am
TweakTown 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

 

HD Tach - CCT 720P 16-Channels

 

western_digital_purple_surveillance_storage_4tb_hdd_review_55

 

HD Tach - CCT 720P 32-Channels

 

western_digital_purple_surveillance_storage_4tb_hdd_review_56

 

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.

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