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There are lots of reasons you might want to boot from a USB device, like an external hard drive or a flash drive, but it’s usually so you can run special kinds of software.

When you boot from a USB device, what you’re actually doing is running your computer with the operating system that’s installed on the USB device. When you start your computer normally, you’re running it with the operating system installed on your internal hard drive – Windows, Linux, etc.
Follow these easy steps to boot from a flash drive, an external hard drive, or some other bootable USB device:

How to Boot From a USB Device
Time Required: Booting from a USB device usually takes 10 to 20 minutes but it depends a lot on if you have to make changes to how your computer starts up.

Change the BIOS boot order so the USB device option is listed first. The BIOS is rarely set up this way by default.

If the USB boot option is not first in the boot order, your PC will start “normally” (i.e. boot from your hard drive) without even looking at any boot information that might be on your USB device.

Tip: The BIOS on most computers list the USB boot option as USB or Removable Devices but some confusingly list it as a Hard Drive option, so be sure to dig around if you’re having trouble finding the right one to choose.

Note: After setting your USB device as the first boot device, your computer will check it for boot information each time your computer starts. Leaving your computer configured this way shouldn’t cause problems unless you plan on leaving the bootable USB device attached all the time.
Attach the USB device to your computer via any available USB port.

Note: Creating a bootable flash drive or configuring an external hard drive as bootable, is a task in itself. Chances are you made it to these instructions here because you know whatever USB device you have should be bootable after properly configuring BIOS.

See our How to Burn an ISO File to a USB Drive tutorial for general instructions on doing exactly that, which tends to be the reason most people need to figure out how to boot from one.

Restart your computer.
Watch for a Press any key to boot from external device… message.

On some bootable devices, you may be prompted with a message to press a key before the computer will boot from the flash drive or another USB device.

If this happens, and you do nothing, your computer will check for boot information on the next boot device in the list in BIOS (see Step 1), which will probably be your hard drive.

Note: Most of the time when trying to boot from a USB device, there is no key-press prompt. The USB boot process usually starts immediately.
Your computer should now boot from the flash drive or USB based external hard drive.

Note: What happens now depends on what the bootable USB device was intended for. If you’re booting from Windows 10 or Windows 8 installation files on a flash drive, the operating system setup will begin. If you’re booting from a DBAN flash drive you created, it will start. You get the idea.
What to Do When the USB Device Won’t Boot
If you tried the above steps but your computer did not boot from the USB device, check out some of the tips below. There are several places that this process can get hung up at.

Recheck the boot order in BIOS (Step 1). The number one reason a bootable flash drive or another USB device won’t boot is because BIOS is not configured to check the USB port first.

Didn’t find a “USB Device” boot order listing in BIOS? If your computer was manufactured around 2001 or before, it may not have this ability.

If your computer is newer, check for some other ways that the USB option might be worded. In some BIOS versions, it’s called “Removable Devices” or “External Devices”.
Remove other USB devices. Other connected USB devices, like printers, external media card readers, etc., could be consuming too much power or causing some other problem, which is preventing the computer from booting from a flash drive or another device. Unplug all other USB devices and try again.
Switch to another USB port. The BIOS on some motherboards only check the first few USB ports. Switch to another USB port and restart your computer.
Copy the files to the USB device again. If you created the bootable flash drive or external hard drive yourself, which you probably did, repeat whatever steps you took again. You may have made a mistake during the process.

See How to Burn an ISO File to USB if you started with an ISO image. Getting an ISO file onto a USB drive, like a flash drive, isn’t as easy as just expanding or copying the file there.


Whether you want to purchase a new custom USB flash drive or just looking to upgrade, there are a few pointers that can make the buying process a little simpler. Remember that these guidelines are not hard-fast rules and should be tweaked to suit your needs.

Go Big
You’ll never regret having too much space on your USB flash drive. While price obviously increases with capacity, you’ll pay less to jump from 8GB to 16GB, for example, than you will should you have to buy a second 8GB drive later down the line.
Get Secure
Many drives come with some kind of data security, including password protection or even fingerprint scanning. The level of security you need will, of course, depend on what you’re putting on the device, but you should look for a drive that has at least password protection. A flash drive’s diminutive size may be convenient, but it also makes them notoriously easy to lose.

Another helpful safeguard is a manufacturer’s warranty, commonly found on most USB flash drives. Manufacturers’ warranties can range from one year to a lifetime and will protect against product manufacturing defects (all warranty terms vary, so check the fine print). However, warranties for flash drives are only worth it if they’re already included with the device; don’t bother purchasing an extended plan from the retailer — it’s not worth your money.

Stay Sturdy
No amount of password protection is going to help you if your flash drive falls apart after a little wear and tear.

Look for drives made with anodized aluminum outer casings or some other kind of hardy material. If you do go with plastic, at least make sure that any caps feature some kind of tether. It also won’t hurt to be waterproof, especially if you’re going to attach it to your keychain.

Hold On
Normally, this site is typically a fan of all things USB 3.0, but when it comes to USB flash drives, it’s usually not necessary.
There’s little point to paying a premium for speed when the drive is only transferring and carrying 32GB of data. The speed jump is negligible at that size unless you have a time-sensitive job that has you using the drive multiple times a day. In that case, make sure your computer is also USB 3.0-compatible before you buy a drive with the same technology.


The size of USB flash drive you need depends on what you are planning to do with it. If you know you’ll only be using the thumb drive to move Word documents from computer to computer, stick with a 2GB or 4GB USB flash drive and you’ll be fine. If you’re planning on archiving your entire photo or music library, you may need a 256GB or larger flash drive. If you’re moving or archiving video, buy the biggest flash drive you can find.
USB Flash Drive Considerations
The capacities of USB flash drives range from 2 gigabytes to 1 terabyte. Although the drives are affordable options for expanding storage capabilities, the price increases with the size. When you are shopping for a flash drive, you’ll also be interested in transfers speed—whether the USB flash drive is USB 2.0 or 3.0—and security.

Estimating Storage Space Needs
There’s no simple formula for estimating your storage needs. The number of photos or songs that fits on a USB flash drive varies widely because of the type of media you use and the size and quality of each file. For example, if each of your photos is 6 megapixels in size, you can fit 1,000 on a 2GB drive, 8,000 on a 16GB drive and 128,000 on a 256GB drive. However as the size increases, the number of photos that fit decreases. If you work with high-resolution photos that average 24MP, you’ll only be able to put 250 on the small 2GB flash drive and 32,000 on the 256GB drive.

The same problem exists when trying to estimate the size of music and video, which also vary in quality. If you place all the files you want to transfer to a USB flash drive in one folder, you can get the size of the folder and that tells you how much space you need to move that one folder. If you shoot HD video, don’t bother with any drive at the small end of the size scale.
A 16GB flash drive holds only one minute of HD video, while a 256GB drive holds just 224 minutes.

In contrast, Word documents and Excel spreadsheets take up little space. If you are a student transferring these types of files between computers, a 2GB drive is all you need.

The Difference Between USB 2.0 and USB 3.0
Whether you choose a USB 2.0 or USB 3.0 depends in part on the device you are transferring from and the port you use. Confirm which speed your computer or other device supports before buying a USB drive. If your equipment supports USB 3.0, buy that speed drive. Its transfer rate is 10 times faster than the speed of a USB 2.0 drive.

About Security
Depending on your usage, you may want to buy a secure USB flash drive. This may not be necessary if you are just transferring a few files from one home computer to another, but if you are using the drive with many computers or are archiving important or proprietary data on the drives, security becomes a concern. The security issues with USB thumb drives include:

  • Their small size may cause them to be lost or overlooked.
    They are hard to track physically. Some companies ban their use for this reason.
    They can transfer malware from one computer to another and have done so frequently.

Nothing can be done about the small size of the thumb drive without forfeiting its portability, but software encryption—on Windows and Mac computers and from security companies—and hardware encryption on the USB drives themselves are available to prevent malware transfer and unauthorized access.


A flash drive is a small, ultra-portable storage device which, unlike an optical drive or a traditional hard drive, has no moving parts.

Flash drives connect to computers and other devices via a built-in USB Type-A plug, making a flash drive a kind of combination USB device and cable.

Flash drives are often referred to as pen drives, thumb drives, or jump drives. The terms USB drive and solid state drive (SSD) are also sometimes used but most of the time those refer to larger and not-so-mobile USB-based storage devices.
How to Use a Flash Drive
To use a flash drive, just insert the drive into a free USB port on the computer.

On most computers, you’ll be alerted that the flash drive was inserted and the contents of the drive will appear on the screen, similar to how other drives on your computer appear when you browse for files.

Exactly what happens when you use your flash drive depends on your version of Windows or other operating system, and how you have your computer configured.

Available Flash Drive Sizes
Most flash drives have a storage capacity from 8 GB to 64 GB. Smaller and larger flash drives are also available but they’re harder to find.

One of the first flash drives was just 8 MB in size. The largest one I’m aware of is a USB 3.0 flash drive with a 1 TB (1024 GB) capacity.

More About Flash Drives
Flash drives can be written and rewritten to an almost unlimited number of times, similar to hard drives.

Flash drives have completely replaced floppy drives for portable storage and, considering how large and inexpensive flash drives have become, they’ve even nearly replaced CD, DVD, and BD disc for data storage purposes.


We are the Voeusb professional USB flash disk production supplier, devoting to USB OEM production. We have skilled technicians, precise USB design and open molding technology. We undertake ODM and OEM orders. In the fields of USB gift, advertisement and functional software application, our company has a wealth of production experience.

Service Items:

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Production capacity of more than 30,000 per day. We are excellent USB production manufacturers with good productivity. We have ability to deal with all kinds of orders. You are welcomed to visit our factory!

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Our company is committed to the technology research, development, production and sales of mobile storage products. We have a strong engineering and technical strength, centralizing a group of professional and creative product-design and development teams on electronic technology. We are the best partners for major companies’ promotional gift, but also the best choice for foreign trade companies.


Quality Control:

We have three checks to strictly control the quality:

1. Full-inspection for all incoming materials

2. Full-inspection for semi-finished products

3. Full-inspection after the assembly, and then packaged shipping

All of our products are in line with CE, FCC, RoHS and other standards.


After-sales service:

5-year warranty for chip USB and 1-year warranty for black colloid USB.

Value-added services:

1. Document preload of deleted-duplicated, undeleted-unduplicated texts and automatically play the file.

2. Customer identification on the drive letter and other value-added services.

3. Computer lock and encrypted partition

4. User identification and other value-added functions.

5. Installing software programs into USB


The categories of usb flash drives can be divided into advertising usb flash drives ,waterproof usb flash drives , glow usb flash drives, creative usb flash drives, etc.

advertising usb flash drives:
It is generally used by business men who use it for their own business or product group. It is divided into two categories, the first kind of AD usb flash drives, namely the reader store an e-commerce site l in advance, with no ordinary usb flash drives function. When a website USB reader insert USB interface of the computer, the computer will automatically enter the e-commerce site .The second AD usb flash drives, can put the customer LOGO for digital color printing processing, form all sorts of color effect, also can undertake processing inferior smooth light effect. It is very beautiful!

glow usb flash drives
Luminous usb flash drives is divided into two kinds, the first category: the usb flash drives can be joined a special in usb flash drives shell which can be luminous material and be similar to shine our effect. It is simple but very practical. The second category: the usb flash drives is through usb flash drives on the PCB of pulling out of a set of power supply circuit powering a light emitting device, light emitting device has many kinds of LED lights, LED screen. It also has a small light bulb (but this is very rare). The usb flash drives can only be issued after the computer brilliant luster.

waterproof usb flash drives
Waterproof usb flash drives: the usb flash drives, it is rarely sold on the market. Generally it is a luxury, for business people. On the general process for waterproof processing: waterproof casing, USB and PCB isolation. There are a lot of using a COB encapsulation technology of the mini usb flash drives, also has the performance of waterproof and shockproof.Performance is very good.

Creative usb flash drives ,
It is the collection of data storage and household life together: in this big family, there is a heart usb flash drives, fish usb flash drives, crystal ornament usb flash drives ;slippers usb flash drives, mini Ann make usb flash drives,, usb flash drives of modelling of Peking Opera. Some of these u sticks can be used for decoration, and some can be used as a hanging ornament, some can make folder. It has the data storage function on the usb flash drives, to the contemporary household life extension and development ,it is a new generation of mobile storage products.