Hard Disk Drive (HDD) is one of the most widely used storage accessory, which uses magnetic recording to store data.
硬盘驱动器是目前应用最广泛的存储设备之一,而硬盘驱动器是采用磁记录来存储和读取数据的。
参考来源 - 磁记录中的PRML技术研究及其应用·2,447,543篇论文数据，部分数据来源于NoteExpress
ABBREVIATION for hard disk drive 硬盘驱动器 [计算机]
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。
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。
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15,000 rpm hdd。
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