1. Interface type
ATA, IDE, SATA, SCSI, Fibre Channel
1. IDE
There are three transmission modes for IDE hard disks: PIO (Programmed I/O) mode, DMA (Driect Memory Access) mode, Ultra DMA (UDMA for short) )model. The hard disk data transfer rate in PIO mode ranges from 3MB/S to 16.6MB/S; DMA (Direct Memory Access) mode is divided into Single-Word DMA and Multi-Word DMA, and the highest data transfer rate is 8.33MB/ s and 16.66MB/s; Ultra DMA mode With the development of technology, the transmission speed has reached as high as 100MB/S.
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Second, SATA
The hard disk with this kind of interface is also called serial hard disk, which is the mainstream hard disk of computer hard disk at present. It has stronger error correction capabilities. Compared with the past, its biggest difference is that it can check transmission instructions (not just data). If errors are found, they will be corrected automatically, which greatly improves the data transmission. reliability.
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Three, SCSI
This interface is not specifically designed for The interface of hard disk design is a high-speed data transmission technology widely used in minicomputers. The advantages are a wide range of applications, multi-tasking, large bandwidth, low CPU usage, and support for hot swapping, but the disadvantage is that the price is high. And because of this, hard drives with SCSI interfaces are mostly used in servers rather than individuals.
Four. Fibre Channel
To improve the speed and flexibility of multi-disk storage systems, Fibre Channel was developed. The main features are: hot-swappable, high-speed bandwidth, remote connection, large number of connected devices, etc.
Five. SAS
It can be regarded as a new generation of SCSI technology, and its interface technology can be downward Compatible with SATA, so SAS drives and SATA drives can exist in a storage system at the same time.
