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One is for power and the other is for data.

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Q: Why does an external hard disk have two USB connections?
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Related questions

What can a USB port do?

You can plug in any device with USB, such as a USB stick or an external hard disk.


What do a usb port?

You can plug in any device with USB, such as a USB stick or an external hard disk.


Which are two common external storage media sources?

External Hard Drive/ USB pen Drive Floppy Disk


Is there an external hard disk with LAN support or network access storage with data reading via USB?

Yes. Any external hard disk should work. You will then need to configure it from the control panel.


Do a external hard disk drive have a graphic card?

Simple answer, no. An external drive does not have a graphics card because it is just a drive that you plug into USB.


What are the examples of secondary storage device?

Usb flash drive S D card DVD and Hard disk


Can you name five storage devices?

DVD-ROMCD-ROMExternal hard diskfloppy diskpen drive


You spilled pop on your laptop and now the only thing you could get out was your hard drive is there anyway for you to get the files off without getting a new laptop?

Yes. You can get an external hard drive case and put the hard drive in that to convert it to an external USB hard disk.Your laptop would have had a 2.5 inch hard disk. Make sure you find an external hard drive case which accepts laptop-sized 2.5 inch hard disk. Also you must keep in mind what type of interface your hard disk uses. If it is SATA, you will need a case which supports it, as opposed to regular ATA-100 (now being called PATA).Put your laptop's old hard disk into that external hard drive case & bingo, its now an external USB disk that you can plug into any computer! Another answer Alternatively, you can purchase a USB to IDE cable and temporarily connect the drive to a desktop computer to retrieve your files.


Which is faster USB stick or hard disk?

Usb Stick.


How do you connect 3 hard drives on a computer?

Most computers have two internal connections for hard drives. You may also connect a third (external) hard drive via USB.


What is the difference between an external USB 2.0 hard disk that needs a power supply and one that does not require a power supply?

A USB hard disks that does not require a power supply is powered by your computer via the USB connection. Where as others require an external power supply because of the amount of power they require. It is usually a "wall wart" type that plugs in to your wall socket with a lead that plugs in to the disk drive.


How many types of computer discs are there?

I'll try to answer, there's a long list. 8", 5.25" & 3.5" floppy. Hard card Hard disk - PATA (used to be known as IDE) Hard disk - SATA Hard disk - External USB WORM drive CD-ROM (both R & RW) DVD-ROM (both R & RW) not to mention USB drives