Mobile Hard Drive Caddy interface there are four:
Parallel interface (ATA interfaces), the USB interface, IEEE1394 interface (FireWire Fire Wire interface), serial interface (SATA interface). Mobile Hard Drive Caddy interface does not mean that the internal hard disk interface, and now most of the internal hard disk interface for the IDE. Four interface differences:
1, the line is old wide first appeared, the advantage is cheap, fast data transfer, but requires an external power supply;
2, USB divided into two categories, USB1.1 and USB2.0, the former slow transmission speed than the latter, is prevalent USB2.0 excuse. Obvious advantages, the speed of data transfer, support hot swap and plug-and-play, no external power supply. Note: See whether your motherboard supports USB2.0;
3, IEEE1394, only the new laptop support the interface used on the desktop interface optional interface card, the price is expensive, requires an external power supply;
4, SATA, the points SATA1.0 SATA2.0 two kinds of characteristics of data transmission speed of ultra-high error correction capability, hot swappable, no external power supply, but most motherboards now SATA external interface, expensive. The purchase must pay attention to, not only look at the interface of the Mobile Hard Drive Caddy's good or bad what the workmanship of the product quality and after-sales is also very important.
Mobile hard disk interface type is used in the mobile hard disk connected to the computer system interface types, not its internal hard drive interface type.
Mobile hard disk connected through the interface to the system, the interface determines its connection with the system performance and data transfer speed.
Choice of removable hard disk, the first thing to consider is the interface type.
Various interface types of data transmission rate is the maximum data transfer rate that can be achieved in the ideal state of the interface, in the practical application because some objective reasons (e.g., the storage device used in the master chip, the production of the circuit board excellent quality, etc.), slows down the transmission rate in the application.
Mobile IBM X61s Hard Drive 2.5 Caddy common market by the external interface divided into four types: parallel interface, USB interface, IEEE1394 interface and SATA interfaces, most of their built-in interface for the IDE interface hard drive to use with the IDE interface.
Hard Drive Caddy Parallel Interface (ATA interface) is the earliest Hard Drive Caddy, is connected through the computer's parallel interface with a computer, which is characterized by the transfusion speed is relatively fast and cheap, the drawback is that the installation is inconvenient to use, requires a separate switching power supply.
Mobile Hard Drive Caddy USB interface is now mainstream, its biggest advantage is easy to use, support hot swap and plug-and-play.
Current USB standard: a USB1.1 interface, the transmission speed limit is only 12Mbps, USB2.0 interface, the transmission speed limit of up to 480Mbps. USB1.1 interface transfer speed to meet the needs of the general exchange of information, the current board USB support USB1.1; although a USB2.0's advantage transmission speed has greatly improved, but the market still have a lot of The motherboard only supports USB1.1, the latest P4 motherboard and laptop really support USB2.0. So before you select USB Mobile Hard Drive Caddy, it is best to understand whether your machine truly support USB2.0 or you bought a USB 2.0 device can only be used when USB1.1. Mobile support USB2.0 interface Hard Drive Caddy prevalent USB1.1 interface mobile IBM Lenovo X61s Hard Drive 2.5 Caddy Kit relatively rare.
The IEEE1394 interface also known as the Frie wire interface (the Chinese commonly called "The Wire"), the high rate of data transmission, IEEE1394a interface can provide 100Mbps, 200Mbps, 400Mbps and other transmission format; IEEE1394b can provide data transfer rates of 800 Mbps. IEEE1394 was above the interface of Apple Computer, in ordinary desktop relatively rare. The disadvantage new notebook computers and mobile PC (although some some have provided an IEEE1394 interface, if you want to on desktop computers must optional interface interface cards), external power supply must be equipped with additional interface interface card , the price is more expensive.
SATA stands for Serial ATA, Serial ATA. This is completely different from the new Parallel ATA hard disk interface type, named after the serial transmission of data. SATA bus with embedded clock signal, with a stronger error correction capability, compared with the past, the biggest difference lies in its ability to transfer instructions (not just data) to check, and if found will automatically correct errors, in the great The extent to improve the reliability of data transmission. The serial interface also has a simple structure, support hot-swappable advantages. But at the moment, most of the computer motherboard does not have an external SATA interface, most of the new computer motherboard only built-in SATA interface.
Compared with Parallel ATA, SATA has a comparative advantage. First, Serial ATA continuous serial data transfer, using a higher frequency to improve the bandwidth of the data transmission in fewer bits wide. Serial ATA once only to send a data, it can reduce the number of pins of the SATA interface, the fewer the number of the connecting cable, the efficiency will be higher. In fact only four pins, Serial ATA will be able to do all the work, respectively, for the connection cable, connect the ground wire to send and receive data at the same time, this architecture can reduce the energy consumption of the system and reduce the system complexity. Second, Serial ATA starting point is higher, the greater potential for development, defined by the Serial ATA 1.0 data transfer rate up to 150MB/sec 133MB/sec highest achievable than most block parallel ATA (ATA/133) The data transfer rate is also high, and has released Serial ATA 2.0 data transfer rate up to 300MB/sec, eventually Serial ATA 3.0 will achieve a maximum data transfer rate of 600MB/sec.
For serial communication, data transmission rate refers to the actual bit rate of the data transmission of the serial interface, the transmission rate of the Serial ATA 1.0 1.5Gbps, Serial ATA is 2.0, the transfer rate is 3.0Gbps. As with other high-speed serial interface, Serial ATA interface is also used to set the encoding mechanism is used to ensure that the data flow characteristics, this coding mechanism would each byte contains eight bits of data (i.e. 1Byte = 8bit) encoded into a 10-bit data (i.e. 1Byte = 10bit), Serial ATA interface for each byte serial data stream contains a 10-bit data so that, after encoded Serial ATA transfer rate corresponding to the actual transfer rate becomes Serial ATA ten one-half, so 1.5Gbps = to 150MB/sec while 3.0Gbps = to 300MB/sec.
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