[其他] WD 刁 Actuator HDD

WD 刁 Actuator HDD

Western Digital has rather high expectations for its dual-actuator HDDs. The company expects the new drives to offer double the sustained transfer rates as well as double the IOPS when compared to existing HDDs. Which if we use existing drives as a baseline, would mean that we're talking about data rates on the order of 500 MB/s as well as 160 ~ 200 IOPS. Meanwhile, although no official numbers were provided ahead of next week's formal reveal, the company did publish a photo of its dual-actuator prototype.

https://www.anandtech.com/show/1 ... ator-hdds-next-week
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有兩個頭會唔會死一個仲可以用?
定係死一個就 88

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呢樣嘢係大機,例如IBM Mainframe上已經玩咗幾十年!有啲玩法係兩套頭的間距是固定的,即內圈一套頭,外圈另一套頭,就好似明明是4片碟變成8片碟,讀寫速度一定快一倍,IOPS都會快咗,因為一套頭的最大行程短咗。但睇相似乎WD係無多到頭,只不過係一棟頭唔再綁死在同一位置,可以上面頭在TRK 0,下面頭在TRK 4096,咁會唔會快咗呢?讀寫應該唔會噃,都係每面碟一個頭!IOPS呢?啲頭可以係唔同位置,都會有改善嘅,但快一倍?又係最理想狀態下囉,咁啱得咁橋你每次讀兩個file,係唔同位置,原本個頭就要行來行去,而家兩套頭,唔使郁,快咗!

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呢樣嘢係大機,例如IBM Mainframe上已經玩咗幾十年!有啲玩法係兩套頭的間距是固定的,即內圈一套頭,外圈 ...
stephenwong 發表於 2019-3-11 09:11

普通HDD同一時間只可以一隻頭讀寫
分開用兩套actuator就可以同一時間用兩隻頭讀寫
就等於用兩隻HDD行RAID-0

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似是seagate patent,同軸的Actuator分成二組獨立actuator

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同 SSD 都仲有一段差距

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幾時有得賣?

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