The English spelling of hard disk data transfer rate is Data Transfer Rate, or DTR for short. The data transfer rate of the hard disk expresses the data transfer speed when the hard disk is working, and is a concrete manifestation of the working performance of the hard disk. It is not static but changes with the specific conditions of the work. When reading the data of different tracks and sectors of the hard disk; factors such as whether the data is stored continuously or not will affect the data transfer rate of the hard disk. Because of the uncertainty of this data, manufacturers often use external data transfer rate (External Transfer Rate) and internal data transfer rate (Internal Transfer Rate) when marking hard disk parameters. External data transfer rate (External Transfer Rate), generally also called burst data transfer or interface transfer rate. It refers to the data transfer rate between the hard disk cache and the computer system, that is, the rate at which the computer reads data from the cache to the corresponding controller through the hard disk interface. The ATA66, ATA100, ATA133 and other interfaces commonly used by hard disks are represented by the theoretical maximum external data transfer rate of the hard disk. The 100 in ATA100 means that the theoretical maximum external data transfer rate of this hard disk is 100MB/s; ATA133 means the theoretical maximum external data transfer rate is 133MB/s; and the theoretical maximum external data transfer rate of the hard disk with SATA interface can be Up to 150MB/s. These are just the theoretical maximum external data transfer rate of the hard disk, which cannot be reached in actual daily work.
