If all the data fits in the cache, then the data is read from disk only once; after that, all requests are satisfied from the cache at memory speed.
如果所有数据都在缓存中，那么只需从磁盘读取一次数据；毕竟，所有的请求都可以用内存速度从缓存中得到满足。
Like the previous optimizations, this optimization collects related data on the disk to optimize for sequential Read optimization.
与前面其他优化一样，这个优化在磁盘上收集相关的数据，以实现相邻读优化。
The next time the data on that page is requested, it need not be read from disk again.
下次请求该页上的数据时，就不需要再从磁盘进行读取该页。
As a result, data is continually written and read from disk rather than from main memory, which is very detrimental to performance.
导致的结果是不断地从磁盘而非主内存读写数据，这是影响性能的重要限制因素。
In other words, it may be removed from the buffer and written back to the disk before subsequent data pages can be read into the memory and processed.
换言之，在后续数据页被读入内存并被处理之前，它们可能已经从缓冲区中删除，并写回磁盘。
When data are contiguous, the time used to access data on the disk is minimized and the database server can read data faster.
当数据连续时，用于访问磁盘上数据的时间最少，数据库服务器可以更快地读取数据。
RAID-Z traverses the available metadata to read only the data that's relevant for the geometry and avoids reading the unused space on the disk.
RAID - Z遍历可用的元数据以便只读取有关几何学的数据并避免读取磁盘上未使用的空间。
Therefore, read events that request data already stored in memory don't generate a trip to the hard disk.
因此，请求存储在内存中的数据的读事件不会访问硬盘。
Loss of data - Data cannot be written to or read from a disk because of a logical or physical problem.
由于逻辑或物理问题，数据无法写入磁盘或无法从磁盘读取。
The ANSI T10 standard provides a way to check the integrity of data read and written from the host bus adapter to the disk and back through the SAN fabric.
ANSIT10标准提供一种方法检查从主机总线适配器 （HBA）通过SAN 光纤写到磁盘和读取回的数据的完整性。
Consider what happens when Linux wants to read or write one of these data structures on a new disk with 4096-byte sectors.
想一下，当Linux想在一个带4096字节扇区的新磁盘上读写这些数据结构时，会发生什么事情。
To ensure the durability of events and actions, Business events can persist or read data from disk at several points during event processing.
为了确保事件和动作的持续性，BusinessEvents可以执行持久化操作或在事件处理过程中的几个不同时间点从磁盘读取数据。
While data was being written to the test filesystem, he attempted to read 16Mb of data from another ext2 filesystem on the same disk, timing the results
在将数据写入测试文件系统的同时，他尝试从 位于同一磁盘上的另一个ext2 文件系统中读取16Mb 的数据，并对此进行计时
Since the file data and the stat_data (inode) information are stored right next to each other, they can normally be read with a single disk IO operation.
由于文件数据和stat _ data(索引节)信息是紧挨着存储的，它们通常能被同一次磁盘IO操作所读取。
Some applications frequently need to read and write large amounts of data to the disk, which is often the slowest step in a computation.
有些应用程序通常会需要从磁盘中读写大量的数据，这通常是整个计算过程中速度最慢的一个步骤。
The files are decrypted when they are read from the disk into memory so that the file data kept in memory is in clear format.
在将文件从磁盘读取到内存时对文件解密，因此文件数据能够以明文格式保存在内存中。
DB2 USES buffer pools to cache the table and index data as they are being read or written to the hard disk drive.
当从硬盘驱动器读写表和索引数据时，DB 2使用缓冲池来缓存它们。
Bits are bits, and any hard disk pulled out of one computer and put into another can easily be read — unless that data is encrypted.
比特数据毕竟是比特数据，可以将硬盘从一台计算机中取出并放入到另一台计算机中，这样就可以很容易地读取其中的数据，除非对数据进行了加密处理。
The file system stores and manages user data on disk drives, and ensures that what's read from storage is identical to what was originally written.
该文件系统存储和管理磁盘驱动器上的用户数据，并确保从存储中读取的数据与原先写的是相同的。
In nowadays information society, a disk is widely used as storage medium because of its high speed of data read-write and high performance price ratio.
在当今信息社会里，磁盘作为存储介质因为其数据读写的高速性和高性价比被广泛使用。
In nowadays information society, a disk is widely used as storage medium because of its high speed of data read-write and high performance price ratio.
在当今信息社会里，磁盘作为存储介质因为其数据读写的高速性和高性价比被广泛使用。
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