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硬盘缓存有什么用？硬盘缓存越大越好？越大肯定越贵但是不一定越好！

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硬盘缓存是硬盘参数之一，很多用户可能并不知硬盘缓存有什么用，在硬盘工作中扮演什么样的角色，并且现在的机械硬盘、固态硬盘缓存也有不同，是不是越大硬盘就越快呢？带着这些问题，我们一起来学习一下小编分享的硬盘缓存相关知识。
 

首先我们来讲讲硬盘缓存的作用

“缓存”是为了平衡高速设备和低速设备之间的速度差异而存在的。因为内存中的数据要写入硬盘，但是机械硬盘比内存要慢许多，就需要很长的时间才能完成任务，表现出来的结果就是写入超级慢。

要解决这种速度上的差异，就需要在之间设置一个“缓冲区”来暂存数据，这就是硬盘缓存的作用。不过需要注意的是，不见得缓存越大性能就越好，还有个用不用得了的问题，传输持续读写速度在150MB/s左右、不超过1TB容量的旧型号机械硬盘，其实64MB缓存就足够了，128MB显然有些浪费，只是吸引用户的手段。

● SSD的缓存

相比机械硬盘，SSD速度要高不少，但是比内存还是慢得多。那为什么会出现无缓存设计呢？这很简单，就是为了省钱。更高速的SSD可以充分使用更大容量的缓存，1TB SSD配1GB缓存很正常，省去了这块的成本，在同容量竞争中就能有一定的价格优势。

现在的无缓存SSD主要有两种方式，一种是借用内存空间做SSD的数据缓冲，即HMB，还有一种更有趣，是把一部分TLC、QLC存储空间模拟成容量小，但速度快的SLC空间，当作存储缓存。



好了到这里我们基本上可以了解到硬盘缓存的作用，还有就是对缓存大小的选择，相信可以在大家选购硬盘上面有一定的帮助哦。

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