Data Transfer Rate Is Used to Measure the Speed of Disk
Data transfer rate is an important indication to measure hard disk performance. It can be divided into external transfer rate and internal transfer rate. External transfer rate is commonly called burst data transfer rate or interface transfer rate. It refers to the speed of outputting data from the hard disk cache. Internal transfer rate is also named maximum or minimum sustained transfer rate. It refers to the speed of reading and writing data of hard disk on the disc.
Data transfer rate is an important parameter to measure the speed of hard disk. It has a great relationship with rotational speed of hard disk, interface type and system bus type. It means the speed of computer that actually finds the corresponding data from the hard disk and transfers them to memory. It is measured by transmission of bytes per second (MB / s). At present, the highest speed of IDE
interface is 133 MB/s while for SATA
, the speed has reached 600 MB/s.
Data transfer rate includes external transfer rate and internal transfer rate. Due to internal transfer rate of hard disk is less than external transfer rate of it, the level of internal transfer rate is the determinant and actual standard to evaluate the overall performance of a hard disk. In general, when the rotational speed of different hard disks is the same with each other, the larger the capacity of a single disk is, the greater the internal transfer rate of the hard disk will be. When the capacity of hard disks is the same with each other, the faster the rotating speed of a hard disk is, the faster internal transfer rate of it will be. If the rotating speed is similar to the capacity of a single disk, internal transfer rate of the new hard disk is fast for its advanced processing technology.