And while the capacity of HDDs has grown exponentially, the speed of these devices has not significantly increased.
而当HDD的容量指数级增加时，这些驱动器的速度并没有实现显著增长。
Therefore, seek time continues to be the largest source of latency in HDDs.
因此，寻道时间一直是HDD的延迟时间的最主要来源。
And this type situation has only worsened as the density and capacity of HDDs have increased.
而且这种状况只会随着HDD密度和容量的增加而变得更坏。
One of the databases had its data stored on EFDs; the other had its data stored on similarly configured FC HDDs.
其中一个数据库将数据存储在EFD中；另一个将数据存储在有相似配置的FCHDD上。
This ensures that, once stored, data is either returned unmodified, or is identified as being "suspect" - much like data on HDDs is safeguarded.
这可以保证数据在存储后，或者未经修改返回，或者被标识为“可疑”—非常类似于受保护的HDD。
One very interesting reliability improvement for ATA HDDs is protection against shock, sudden jolts that can destroy HDDs in laptop computers.
ATAHDD的一个非常有趣的可靠性改进就是震动保护，这种突然的晃动会破坏笔记本电脑的 HDD。
As a result, a significant amount of space on HDDs (greater than 50% in many cases) is never used or under-utilized.
结果，HDD上有大量的空间(大多数情况下大于50%)是从不使用或很少使用的。
Using innovative techniques and components, EMC's EFDs have been optimized for writes and longevity, The result is a significant improvement in EFDs write times, as compared to HDDs.
通过使用创新性技术和组件，EMC的EFD进行了写操作和使用寿命优化。这样EFD的写操作响应时间相对于HDD有了很大的改进。
Now, the most commonly used enterprise hard disk drives (HDDs) are limited by the rate of head movement, the speed of the spinning platter, and seek latency.
现在，大多数常用的企业硬盘驱动器(HDD)都受到磁头移动速度、盘片旋转速度和查找延时的限制。
But although SSD costs are declining every quarter, SSDs are still more expensive than HDDs.
但是，虽然SSD的成本每个季度都在递减，但是SSD仍然比HDD昂贵。
The type of CPU used, IOPS needed, and throughput desired are the factors that determine exactly how many HDDs are required.
使用的CPU类型、所需要的 IOPS和预期吞吐量是准确确定所需要的 HDD 数量的因数。
To confirm placement options for DB2 objects on SSDs, we chose an IBM DB2 OLTP workload to drive a series of tests, starting with a baseline of all database files on HDDs.
为了证实DB2对象在SSD 上的性能效果，我们选择一个IBM DB2OLTP工作负载来进行一系列的测试，首先以所有数据库文件放在 HDD 上的场景作为基准。
It is likely that you will have a mixture of HDDs and SSDs, so you can allocate the buffer pool space thus saved to the table Spaces on HDDs, which need it more.
很有可能您混合使用HDD和SSD，那么就可以分配缓冲池从而节省HDD上的表空间，而HDD也更需要空间。
But SSDs are different from hard disk drives (HDDs) in that they are consumable.
但是SSD不同于硬盘驱动器(Hard Disk Drive,HDD)，因为它们是可以消耗掉的。
Chrome OS netbooks do not have HDDs but instead they use flash based memory solutions or solid state drives (SSD) for that.
ChromeOS上网本并没有硬盘驱动器(HDD)，而是采用了基于闪存的内存解决方案或是固态硬盘(SSD)。
Silent operation - SSDs are completely silent when they are running, HDDs are most definitely not
工作静音——SSD运行时完全静音，硬盘驱动器则绝对不可能。
When used in OLTP environments, EFDs offer the following benefits over traditional HDDS.
在OLTP环境中，使用efd比传统的HDD有以下方面的优点。
Figure 1: SSDs easily outpace the 15,000 RPM HDDs commonly used for enterprise applications.
图1：ssd轻松超过常用于企业应用的15,000rpmhdd。
Heads flying height on modern HDDs is about 5-10 nanometers.
飞行团长对现代硬盘高度约5 - 10纳米。
The software allows you to block any viruses or threats that might infect pen drives or external HDDs. You may easily scan the USB drive for malware.
该软件可以自动扫描任何USB驱动器连接到你的计算机，以确定是否有任何病毒，恶意软件和其他威胁。
These connectors were installed in large number for interfacing hard disk drives (HDDs) to processor boards about 10 years ago.
年前，这些连接器被大量地应用在硬盘驱动器和处理器的界面中。
PCMARK 8 Storage measures the performance of SSDs, HDDs and hybrid drives in your system. The results are not influenced by CPU or GPU performance.
PCMARK8存储测试衡量你系统里的固态硬盘，机械硬盘和混合硬盘性能，测试结果不受到CPU或者GPU性能的影响。
But other portable music players with HDDs (Hard Disk Drives) or silicon devices have become popular.
但采用硬盘或是半导体设备的播放器变的越来越流行。
But other portable music players with HDDs (Hard Disk Drives) or silicon devices have become popular.
但采用硬盘或是半导体设备的播放器变的越来越流行。
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