数据中心的数据存储能力靠的是各类的存储设备，而存储设备有三大类，包括硬盘三大种类(SSD、HHD、HDD)
固态硬盘(Solid State Drive):
用固态电子存储芯片阵列而制成的硬盘，由控制单元和存储单元(FLASH芯片、DRAM芯片)组成。固态硬盘在接口的规范和定义、功能及使用方法上与普通硬盘的完全相同，在产品外形和尺寸上也完全与普通硬盘一致。被广泛应用于军事、车载、工控、视频监控、网络监控、网络终端、电力、医疗、航空、导航设备等领域。
优点：读写速度快、防震抗摔性、低功耗、无噪音、工作温度范围大、轻便
缺点：容量小、寿命有限、售价高
混合硬盘(hybrid harddrive，HHD):
是既包含传统硬盘又有闪存(flashmemory)模块的大容量存储设备。闪存处理存储中写入或恢复最频繁的数据。很多公司开始提供这项技术的变体，他们期望它会在高端系统中受到追捧，尤其是在笔记本电脑和个人数字助理中。
相比传统硬盘，混合硬盘(hybrid hard drive，HHD)有很多
优点：
（1）应用中的数据存储与恢复更快，如文字处理机
（2）系统启动时间减少
（3）功耗降低
（4）生成热量减少
（5）硬盘寿命延长
（6）笔记本和PAD的电池寿命延长
（7）工作噪声级别降低
缺点：
（1）硬盘中数据的寻道时间更长
（2）硬盘的自旋变化更频繁
（3）闪存模块处理失败，不可能进行其中的数据恢复
（4）系统的硬件总成本更高
传统硬盘(HDD，Hard Disk Drive的缩写)即硬盘驱动器的英文名。最基本的电脑存储器，我们电脑中常说的电脑硬盘C盘、D盘为磁盘分区都属于硬盘驱动器。目前硬盘一般常见的磁盘容量为80G、128G、160G、256G、320G、500G、750G、1TB、2TB等等。硬盘按体积大小可分为3.5寸、2.5寸、1.8寸等;按转数可分为5400rpm/7200rpm/10000rpm等;
SSD和HDD的比较
在过去10年中，CPU的性能提升了150倍以上，而传统硬盘才提升了1.5倍不到，这种不均衡的发展，极大的影响了整体性能的提升，尤其在I/O方面，而且SSD(固态硬盘)相比起传统硬盘，它没有磁头，马达，磁盘等一系列的零件，搭载NAND Flash芯片作为存储介质，在运行速度，功耗，轻便等方面是传统硬盘所无法比拟的。
目前传统硬盘因为成本低廉等因素依然占据着硬盘市场的主要份额，然而随着SSD的成本不断的降低，技术不断提升与系统更好的支持等因素，而且目前主流的笔记本电脑也都均配置SATA和mSATA接口，包括目前的超极本(Ultrabook)也只有搭载SSD才可能实现“更轻，更快，更低功耗，未来取代传统硬盘也是大势所趋。
现在你知道固态硬盘和混合硬盘的区别了吗？
镇江高防护段（TCP_SYN,ACK,RST）展示：
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原文链接：https://it.sohu.com/a/689635578_121724547
