Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 152 emmc,详细教您eMMC和UFS闪存有什么区别
- 分类：u盘教程 发布时间： Warning: Use of undefined constant newstime - assumed 'newstime' (this will throw an Error in a future version of PHP) in /data/www.zhuangjiba.com/web/e/data/tmp/tempnews1.php on line 156 2018年04月03日 11:55:07
对于手机，普通用户通常比较了解的大多都是CPU、GPU部分，对于内存方面，这几年经过各种发布会不断的“科普”，eMMC和UFS都是存储器的一种标准，大家可以理解为机械硬盘和SSD硬盘，那么两者有什么区别，下面，小编就来跟大家聊聊eMMC和UFS闪存有什么区别。
日常选机大家往往关注64GB、128GB等存储空间，却很少像选笔记本关注SSD一样关注手机闪存规格。而闪存就是手机重要的配置。无论是eMMC还是UFS都是在NAND存储芯片的基础上，而eMMC和UFS闪存有什么区别？有很多的用户心存疑虑的，下面，小编跟大家介绍eMMC和UFS闪存的区别。
eMMC和UFS闪存有什么区别
虽然说eMMC闪存和UFS闪存在外观和作用上都没明显区别，但是实际上两者的内部结构却有着本质上的差异。eMMC闪存基于并行数据传输技术打造，其内部存储单元与主控之间拥有8个数据通道，传输数据时8个通道同步工作，工作模式为半双工，也就是说每个通道都可以进行读写传输，但同一时刻只能执行读或者写的操作，与PC上已经淘汰的IDE接口硬盘很是相似。
UFS电脑图解-1
而UFS闪存则是基于串行数据传输技术打造，其内部存储单元与主控之间虽然只有两个数据通道，但由于采用串行数据传输，其实际数据传输时速远超基于并行技术的eMMC闪存。此外UFS闪存支持的是全双工模式，所有数据通道均可以同时执行读写操作，在数据读写的响应速度上也要凌驾于eMMC闪存。
emmc电脑图解-2
因此现在有不少人将UFS闪存比作PC上的SATA接口硬盘，小编认为这个并不准确，因为SATA硬盘虽然用的是串行技术，但是其本质上使用的是ATA规范，仅支持半双工模式。实际上UFS闪存采用的是SCSI结构模型并支持对应的SCSI指令集，因此其应该相当于服务器平台上常见的SAS硬盘而不是普通的SATA硬盘。
emmc电脑图解-3
正因为eMMC闪存与UFS闪存在内部结构上存在着本质上的区别，这让两者的理论带宽产生了极大的差异。近年来比较常见的eMMC闪存多应用eMMC 4.x或者5.x规范，其中eMMC 4.5常见于低端设备，理论带宽为200MB/s，现在已经基本淘汰；而eMMC 5.0/5.1标准在目前来说仍算主流，理论带宽分别为400MB/s和600MB/s，从数字上看并不算低。
emmc电脑图解-4
然而与UFS闪存相比，eMMC闪存的这点理论带宽就不够看了。UFS闪存的相关标准是在2011年2月份首次亮相，当时的UFS 1.1标准其已经可以提供相当于300MB/s的理论带宽，而eMMC闪存要到2012年的eMMC 4.5标准时才可以提供200MB/s的理论速率。只是由于当时的应用环境以及产本成本等因素的限制，USF 1.1标准未能得到大规模的推广。
直到2014年UFS 2.0规范出炉后，eMMC闪存才被彻底碾压。UFS 2.0规范分为两部分，第一部分是UFS HS-G2规范，也就是我们常说的UFS 2.0，其单通道单向的理论带宽就可以达到1.45Gbps的水平，双通道双向的理论带宽就是5.8Gbps；而第二部分的UFS HS-G3标准，也就是我们常说的UFS 2.1，其理论带宽更是UFS 2.0的翻倍，达到11.6Gbps，eMMC闪存彻底望尘莫及了。
emmc电脑图解-5
性能差异实测：
由于UFS闪存和eMMC闪存都是嵌入式存储芯片，我们无法在同一测试平台上查看他们的差异，不过我们可以通过配置相近的手机来得到一个参考数据。这次参与对比的两台手机是我们评测室中同事的自用产品，其中一台是一加手机3，另一台则是联想ZUK Z2，两者均基于骁龙820处理器打造且均为64GB内置存储，其中一加手机3拥有6GB内存，使用UFS 2.0闪存和基于Android7.1.1的氢OS系统；ZUK Z2拥有4GB内存，使用eMMC 5.1闪存以及基于Andoird 7.0的ZUI系统。
测试软件使用的是AndroBench 5.0.1，全部设置为默认，测试时两台手机均为日常使用状态，其中一加手机3的内置存储尚有约30GB的可用空间，而ZUK Z2则有接近47GB的内置存储可用空间。
关于eMMC和UFS闪存的区别，小编就跟大家讲到这里了。
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