A few things to know about the power of mobile hard disk box

When a hard drive 2.5 " balance not spent , to take advantage of the many people choose to buy a hard drive box , mounted disk array and use it as a portable hard drive . However , there are many who see the is where you plug in the drive for mobile computers that receive and spend the ordinary , but then again no other machine ( in this case 2.5 " perfectly healthy ) i , or if they are getting flutter , drive erratic running slow . Therefore, they think that the hard drive 2.5 " faulty , was " mechanical damage " , but that 's not true , then why this cause ?

The answer is because the amperage that the drive required ( because the voltage is always 5V then ) , one thing that many people do not care . Specifically , an electrical device to be powered , it will run , this case is the hard drive . The correct reference voltage so that it works very well recorded on stamps of the product , for example in the drive voltage is below 5V and 700mA amperage , who brought two parameters together , we have its power consumption is P = U x I = 5 x 0.7 = 3.5 W. There are many hard drive 2.5 " even just 500mA , ie consumption of only 2.5 W only.





In theory, USB 2.0 port on the computer for a magnitude 0.5 (500mA), today, many computers can this port power supply is 5V and 1A, ie the capacity of 5W (In particular there are computer has USB 2.0 to 1.5 amperage A Macbook Pro for example). So theoretically, it would be enough to supply electricity to the hard drive on the side, but only meet half for the SSD.

With today's USB 3.0 port, it is possible for a current 1A - 2A, the equivalent of 5 - 10W, enough power to meet the above HDD and SSD.



Thus, a common condition that we encountered when using portable hard drive ( when used with the outer box buy 3rd party ) when the computer is receiving the drive , sometimes it does not , then most all power derives not so enough . Therefore, to minimize this situation , the better you should be aware of the drive voltage , the power that it consumes how many watts .

The No. 2 , the drive box that we buy is capable of much current load A , to provide sufficient capacity for the consumption of the hard disk was inserted . So select the brand of hard drive box a little . Box to solve some major power status , it can add extra USB cable for power evacuation numerous additional (ie the black cable in the figure below ) . The voltage parameters of the box are clearly within the parameters of the product .

So the easiest way to overcome the drive to have high power consumption , we should choose the box , USB SATA cable to the power cord that has more women , to help it double the amperage supply for the hard drive .