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Auroras777 wrote:
隨便google一下 就發現中文的部分主要是電腦王提起
purple這種紫標硬碟的allframe技術 是犠牲ECC or CRC換來的不掉格表現
首先以WD官網資料來講 從頭到尾也沒提過它會犧牲ECC
http://wdc.com/ch/products/products.aspx?id=1210#Tab2...(恕刪)
可能電腦王是參考這篇訪問 Jermaine Campbell, WD Country Manager for the UK
AllFrame is tailored for the surveillance market by making an important distinction between traditional IT applications and video surveillance applications. In the IT world, you have to ensure that every bit of data is checked to ensure 100% data integrity. If something is missing, the drive will stop and attempt to fix the error.
In video surveillance, in which the data is streaming in continuously, stopping will create an unacceptable backlog in recording which could result in the loss of entire frames.
WD Purple surveillance-class hard drives equipped with AllFrame technology work with ATA streaming to reduce frame loss – key to the surveillance application.
後面還提到 AllFrame 技術包含抑制震動的功能...
AllFrame also works to reduce interruptions caused by vibrations within the DVR. If you pack two or more hard drives into a DVR, along with fans and other devices, it can lead to an exponential build up of vibrations which can seriously affect the performance of hard drives.
Campbell says that AllFrame analyses the vibrations and then applies compensation to the arm that holds the write head (actuator), keeping it stable. Without Allframe technology these vibrations make it very difficult for the head to stay on track resulting in performance losses.
我 NAS 上也是用 WD 紫標 6TB，不過我都是拿來儲存美劇，不用 24 小時運轉...
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