驱动器定位(寻道时间)。
因此，寻道时间一直是HDD的延迟时间的最主要来源。
Therefore, seek time continues to be the largest source of latency in HDDs.
选择从当前磁头位置所需寻道时间最短的请求。
Selects the request with the minimum seek time from the current head position.
寻道时间平均值一般为几毫秒，并且它取决于驱动器类型。
Seek time typically averages a few milliseconds and is dependent upon the drive type.
内部边缘(inneredge)通常具有最短的寻道时间。
应该寻找比较长的寻道时间，因为它们会导致应用程序性能降低。
Look for long seek times, as they can result in decreased application performance.
模拟试验表明，磁道预留技术能减少30%以上的寻道时间。
读操作的完整硬盘寻道时间是 7.4毫秒，而写操作是 7.9 毫秒。
The full disk seek time is 7.4 milliseconds for reads and 7.9 milliseconds for writes.
作为一般规则，靠近中央的数据要比靠近外边缘的数据具有更快的寻道时间。
As a general rule, data that is written toward its center has faster seek times than data written on the outer edge.
其读写系统使用了飞行式光纤光学头，极大程度地降低了平均寻道时间。
By the use of the fiber optical head, the average access time of the storage system is decreased effectively.
数据传输时间一般几毫秒，所以旋转延迟时间和寻道时间是一个物理hdd的主要磁盘延迟时间来源。
Data transfer times are typically fractions of a millisecond, so rotational latency and seek time are the primary sources of disk latency on a physical HDD.
接收用户输入参数，包括程序访问的磁道号等，输出结果包括访问的磁道顺序，平均寻道时间等。
Receiving user input parameters, including the program to access the track number, etc., track output including sequential access, the average seek time and the like.
针对如何提高磁盘调度效率的问题，提出了一种基于平均寻道时间(ast)的磁盘调度优化算法。
To improve the efficiency of disk scheduling, this paper proposed an optimization algorithm of disk scheduling based on the Average Seek Time (AST).
OS磁盘调度演示程序(有图形演示)先来先服务的磁盘调度功能最短寻道时间优先的磁盘调度功能。
OS disk scheduling demo first come first served the shortest seek time disk scheduling priority function of the disk scheduling functions.
OS磁盘调度演示程序（有图形演示）先来先服务的磁盘调度功能最短寻道时间优先的磁盘调度功能。
OS disk scheduling demo first come first served the shortest seek time disk scheduling priority function of the disk scheduling functions.
例如，一个15,000RPM驱动器的读操作需要大约3.5毫秒的平均寻道时间，写操作则需要大约4毫秒。
For example, a 15,000 RPM drive has an average seek time of approximately 3.5 milliseconds for reads and 4 milliseconds for writes.
所有版本均配备8MB的缓冲，他们正在与3.5毫秒，4.0毫秒的平均读取寻道时间额定平均写。
All versions are equipped with 8 MB buffer and they're rated with 3.5 ms average read and 4.0 ms average write seek time.
如果有多个磁盘，那么把负载分配到不同的磁盘上是加快读写速度的有效方法，因为磁盘延迟的最大组成部分是寻道时间。
If you have several disks, splitting load onto separate spindles is an effective way of making reads and writes faster because the largest component of disk latency is the seek time.
当应用程序发出磁盘请求的速率快于磁盘返回数据的速率时，操作系统会让磁盘请求排队，还可能调整请求的次序以降低寻道时间。
The operating system queues disk requests when the applications issue them faster than the disks can return the data, optionally reordering them to minimize seeking.
由于它不是以高速旋转的磁盘作为存储介质，数据读写时不需要寻道时间，因此它有着传统硬盘不可比拟的顺序和随机存储速度。
Since it is not using high speed spinning disks as storage media like traditional hard disks, SSD obtains much higher sequential and random access speed than traditional hard disks.
WDS25硬盘与发烧级别的VelociRaptor产品有几分类似，不过前者的读写速度更快，其读取/写入寻道时间分别只有3.6ms和4.2ms。
Superficially, the WD S25 appears similarly to the VelociRaptor, but it has much faster read and write seek times at 3.6 ms and 4.2 ms respectively.
WDS25硬盘与发烧级别的VelociRaptor产品有几分类似，不过前者的读写速度更快，其读取/写入寻道时间分别只有3.6ms和4.2ms。
Superficially, the WD S25 appears similarly to the VelociRaptor, but it has much faster read and write seek times at 3.6 ms and 4.2 ms respectively.
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