论文部分内容阅读
最常用的硬盘接口有两种,ATA(经常称为IDE或EIDE)和SCSI,用来连接硬盘和计算机,并控制两者之间数据的传输。下面分别讲讲在选择这两种硬盘接口时应当注意的事情。 EIDE对大多数普通用户是较好的选择。因为它比SCSI便宜,而且不需要SCSI卡,更容易安装。在多数应用中,EIDE实际的性能与SCSI差不多。但是,如果您需要特别高速的传输速率,SCSI是较好的选择。 SCSI接口采用了总线专用技术,即同时执行多个SCSI设备的数据传输操作以减少CPU的负荷,这使SCSI接口的性能比EIDE接口高出一截(但最近新出现的EIDE设备已具有同样的性能)。这个技术,在同时运行多个设备或执行连续的数据传输的情况下特别有用。例如,在一个CD-R刻录机上刻一张CD-ROM时,需要从硬盘到CD刻录机上不间断地传输数据。SCSI的接口可以将连续的数据流传送到刻录机,从而使CPU专注于刻制CD-ROM。相反在使用EIDE接口的情况下,CPU在硬盘和刻录机之间来回处理,从而可能导致整个刻录过程的失败。
There are two most commonly used hard disk interfaces, ATA (often referred to as IDE or EIDE) and SCSI, which connect the hard disk to a computer and control the transfer of data between the two. The following talk about the choice of these two hard disk interface should be aware of things. EIDE is a good choice for most average users. Because it is cheaper than SCSI and does not require a SCSI card, it’s easier to install. In most applications, EIDE actual performance and SCSI almost. However, SCSI is a better choice if you need a particularly high speed transfer rate. The SCSI interface uses bus-only technology that simultaneously performs data transfer operations on multiple SCSI devices to reduce the CPU load, which gives the SCSI interface a fraction of the performance of the EIDE interface (but recently the newer EIDE devices already have the same performance). This technique is especially useful when running multiple devices at the same time or performing continuous data transfers. For example, when a CD-ROM is engraved on a CD-R recorder, it is necessary to transfer the data continuously from the hard disk to the CD recorder. The SCSI interface delivers a continuous stream of data to the recorder, allowing the CPU to focus on the CD-ROM. Conversely, when using the EIDE interface, the CPU processes back and forth between the hard disk and the recorder, possibly causing the entire burn process to fail.