Subject: Storage | February 25, 2014 - 08:00 AM | Allyn Malventano
Tagged: western digital, wdc, WD, surveillance, Purple
Western Digital has several lines of hard disks to choose from. You have Greens, Blues, Blacks, enterprise RE's, and even ones named after dinosaurs. Then came a mix of RE and GP in the form of the RE4-GP. Then came the Red series, which carried some more of the enterprisey features from the RE series over into a NAS-tailored drive that sipped power like a Green. Then there was the AV-GP which took a green and tweaked the firmware to better handle multiple video streams being read to and written from the disk simultaneously.
You'd figure they had every possible angle covered, but apparently there was a hole to fill. Turns out the home / small business surveillance market is a bit of a big deal. We're talking about those security systems you see capturing 16 or even 32 video streams simultaneously. Add the fact that these larger systems tend to store their streams to a RAID as opposed to a single disk. What was needed was a drive capable of handling a greater number of simultaneous streams than an AV-GP, while also carrying over the RAID features of the Red, and doing so without driving costs into the enterprise territory of the SE/RE.
Behold the solution:
The WD Purple is an Advanced Format HDD that is optimized for recording up to 32 HD video streams simultaneously:
Writing 32 separate streams to a hard drive would usually lead to the heads thrashing about, trying to keep up with what appears to be random writes. The Purple has much smarter firmware that has been tuned for this specific purpose (seen above maintaining 50% idle time while handling 32 HD streams). While these firmware optimizations would hurt performance in normal consumer use, for heavy surveillance usage, this is likely the closest you can get to SSD performance for this application - without high cost/GB of using solid state as a solution to such a capacity hungry problem.
Speaking of cost/GB, Purple drives are quite reasonable, starting at $89 for 1TB up to $199 for the flagship 4TB capacity.
Press blast after the break: