WD Purple hard drive

WD says its new Purple hard drives are optimized for 24/7 video surveillance

Name an application and it seems Western Digital has a colored storage device optimized for it. Today, the company unveiled its WD Purple drives: A class of hard drives that WD says is optimized for mainstream video-surveillance applications.

Available in capacities from 1- to 4TB, WD’s Purple 3.5-inch drives are designed specifically for the rigors of video-surveillance, where the drive spends the vast majority of its time writing. “The hard drive [in a video-surveillance system] is writing more than 95 percent of its time,” Richard Reid told me in an embargoed briefing last week. Reid is in charge of product marketing for WD’s Digital Video product line. “We’ve optimized the hard drive and its firmware specifically for surveillance applications.”

WD is aiming the Purple drive at OEMs building mainstream video-surveillance systems and NAS boxes designed for pairing with IP video cameras, as well as home, small office/home office (SOHO), and small- to medium-sized businesses (SMB) looking to upgrade existing systems. The drives are designed to be installed in table-top surveillance systems with 1 to 8 drive bays that support 1 to 32 IP surveillance cameras. The drives are rated for workloads of 60TB of writes per year and are backed by a three-year warranty.

WD Purple hard drive

WD claims its Purple series drives outperform the competition by a wide margin with systems supporting up to 32 cameras. 

“System manufacturers typically ship even multi-bay drives with just one small-capacity drive,” Reid said. When the system runs out of storage, it simply writes over the earliest recordings, which means you could lose crucial forensic evidence if a break-in or other event occurred. “If you want coverage for several days,” Reid said, “you’ll need to expand the storage to cover that time.”

Reid touted WD’s new AllFrame technology—a caching algorithm in the drive’s firmware—as the Purple series “secret sauce.” According to Reid, AllFrame works in conjunction with the ATA Streaming command set (which puts a priority on the time to transfer data over the integrity of the data) to reduce write errors and mitigate frame loss. If your cameras capture a recording of a burglar breaking into your home or office, but the hard drive hiccups on the one frame that shows the intruder’s face, the entire recording is pretty much useless.

WD claims its Purple drives are only about 5 percent faster than the competition when supporting up to 16 cameras, but that its drives are significantly faster in configurations supporting up to 32 cameras. The company also said its Purple drives are 45 percent more power efficient than the competition when the drive is idle, streaming, writing, reading, and particularly when spinning up.

Reid said WD will be supplying OEMs directly at first, but that the drives would be available in retail channels such as Amazon and NewEgg soon. A single 1TB drive costs $90, 2TB drives are $120, 3TB drives are $160, and 4TB drives are priced at $200. 

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