Most smartphones come with 4GB to 64GB of internal storage, but that space can fill up fast with pictures, videos, games and apps. Adding extra smartphone USB storage to your device expands your capacity to collect data and allows you to back up your important personal files. These small storage devices link with your smartphone and give you the extra room you need to store your digital possessions.

Some of the top devices include the Sanho Hyperdrive and the SanDisk Connect 32GB Wireless Flash Drive. These drives work with Apple and Android operating systems and give you alternative options for smartphone storage.

Smartphone External Storage: What to Look For

As you try to find the right smartphone pen drive for you, there are a few important factors to consider. First, it helps if you know how much space you need. Compatibility with your devices is also important. Most of all, you want to make sure your stored information is highly secure.

Overall Capacity
The USB flash drives for smartphones range from 16GB to 1TB, which gives you a large selection to choose from. The amount of external storage you need is entirely dependent on how much content you want to store. Those who download smaller files lean toward the lower end of the spectrum. Those who have many files to download or who have large downloads like HD movies or high-resolution games should consider purchasing more space.

Additional Compatible Devices
Smartphone external storage packs are often compatible with multiple computing devices. In addition to the iPhone, some of these devices allow you to store information from your iPad, Android smartphone, PC, Kindle Fire, Windows and Mac operating systems and other tablets. All of the products specify which systems and devices are compatible, giving you a combination of at least two of the ones listed above.

Some of the drives allow you to set a password to gain access to the information on the drive. If you decide to store personal information like financial documents or legal records on the device, this is a feature that may be important to you.

Adding external storage for your iPhone, Android or other device gives you the option to keep all of those pictures and videos without having to delete your applications to make space. It also lets you keep the information for years to come by plugging it into a compatible device to view what you saved. Look through our selection and find the one that suits your needs.

iUSBport HD Review

The iUSBport HD has all the ports necessary to share your files with other devices. Able to connect to your devices wirelessly, you can share with any system with a compatible USB port.

This USB flash storage for smartphone features a USB 3.0 port, an SDXC port and a micro USB port. The USB 3.0 port allows you to connect other devices with a USB port, like your laptop or desktop computer. The SDXC port lets you expand the memory storage by up to 256GB to transfer existing files from the drive. The mini USB port is mainly used for recharging the device, which uses a 3850mAh battery that is designed to last about eight hours. However, the design of the smartphone external storage device is equipped to link with devices wirelessly.

Since it doesn't need to be plugged in to any devices, it features no exposed connectors, so it can be placed safely in your pocket or purse without potential damage to the fabric around it or to the device itself. It allows two-way transfers (sending and receiving data) with up to 12 connections at a time wirelessly.

With the terabyte of space available, you are able to save a large amount of media and documents on the smartphone external storage. As far as media goes, a terabyte gives you approximately 17,000 hours of music, 1,000 hours of video, 310,000 images or about 500 hours of movies. Since it requires no internet connection to function, this allows you to use your phone or laptop to access your media during road trips and vacations, so you are able to listen to music or watch a wide range of your saved movies.

Featuring a lighted LCD display, your iUSBport HD drive comes with a user's manual, a micro USB charging cable and a USB 3.0 cable. A charger is not included with the set and needs to be purchased separately. The USB flash storage for smartphone comes with a one-year limited warranty, which begins on your date of purchase. It does not cover any content you load onto the device and requires that you email or call the company for any warranty claims.

The iUSBport HD conveniently connects to any iPhone or Android device. It has a rechargeable battery, but the package does not include an actual USB charger, meaning that you must use an iPad to charge it unless you decide to purchase a charger separately.

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My Passport Wireless Review

My Passport Wireless provides external storage for smartphone and a lot more. This versatile device can wirelessly connect to your MAC, PC, tablet and smartphone so you can easily share files and stream media. It even has an SD slot so you can upload files directly from an SD card. All this functionality comes in an extremely small and lightweight package and it stores a large amount of data —up to 1TB. Connect multiple devices using no wires to back up, transfer and stream files. This drive is powered by a built-in rechargeable battery.

My Passport Wireless is an external storage device for iPhone and Android. You can use it to wirelessly connect with up to 8 devices at one time. This unit acts as network attached storage where files can be shared among your whole household. Use this as a Wi-Fi hub to share an internet connection among multiple devices. Even when you are not connected to the Internet, you can connect to your other devices and share files with ease.

The unit comes in a very small package. It measures approximately 5.0 X 3.3 X 1.1 inches in size. The My Passport Wireless is great for travel. You can transfer your photos from your smartphone to the drive to make more room without having to bring along a laptop. If you prefer to use a DSLR to take photos, you can upload your photos to the drive by inserting your camera’s SD card directly into the drive where it will automatically upload your image files to the drive.

Use Western Digital’s My Cloud smartphone app to upload your files to your My Passport Wireless or to the cloud using your Dropbox, Google Drive or OneDrive account. With the app, you can access media files or documents using your mobile device. You can quickly transfer your data using the USB 3.0 connection. Instead of taking up valuable space on your phone, you can take your music library wherever you go. If you want to use it to watch HD video, you can stream to 4 movies simultaneously, including DLNA/UPnP devices such as smart TVs, media players and consoles.

My Passport Wireless secures your files using Wi-Fi password protection for every file you save. Lock USB access using Drive Lock located in the device’s intuitive dashboard.

For its versatility, small size and intuitive app, the My Passport Wireless is a great way to store, transfer and stream your files to and from your Apple or Android smartphone and other devices. This device is good to look at if you are an electronics power user that wants to keep their files accessible everywhere or a traveler that loves taking photos and staying connected.

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Patriot Review

The Patriot Stellar 64GB USB/OTG 3.0 Flash Drive allows you to connect your Android smartphone to your tablet or computer, backing up your important data securely. It is available in three different colors.

This USB flash drive for smartphone is geared toward people with an Android device. Those using an iPhone or other Apple product will not be able to connect to this drive. On one end of the drive, a micro USB connector is concealed under an attached cover. This cover helps to protect the small connector from potential damage when it is being stored. The other end connects to a USB 3.0 port within your computer. It is not concealed and, therefore, can be damaged if not carefully put away.

In order to use the flash drive for Android, you must make sure you have a compatible device. Your smartphone must be an Android 4.0 OS or later to be compatible with the software and the connector. If you run the program from your tablet, it accommodates Android 3.2, 4.0, 4.1 and 4.2. Tablets with Windows software are only compatible if they are using version 8.1. While plugged into your computer, it works with Windows 8, 7, Vista, XP, 2000, ME, Linux 2.4 and later and Mac OS9, X and newer.

In order to transfer your files between your Android device and your smartphone USB storage, it doesn't require any particular application. Once you plug in the device, you are almost instantly able to access files with the specialized plug-and-play technology. However, because of this quick access, anyone who has physical access to the drive can use it without requiring a password for your information. The device doesn't require an internet connection or battery power to function. It provides 64GB of storage, allowing you to retain at least 8,000 songs or 21,000 images.

With a two-year warranty, this USB flash drive for smartphone is covered for any malfunctions that are the fault of the manufacturer. However, this warranty doesn't cover your data on the device. The drive weighs about 3 grams and is small enough to keep in your pocket or purse. It is available in black, yellow or orange and made of a strong aluminum material to protect it from external damage.

The Stellar 64GB USB/OTG 3.0 Flash Drive is limited to Android devices and any computer with an up-to-date USB port. This excludes Apple products, and it does not password-protect your data.

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SanDisk Connect Review

The SanDisk Connect 32GB flash drive is compatible with Android and iPhone devices. It lets you retain your personal information within the flash drive and is safer than uploading your information to the cloud or other online databases.

Created with three different storage capacities, this USB flash drive for smartphones lets you access your documents and media files from your home computer or smartphone. With 32GB, you can save upwards of 13,000 images at 5MP, over 9,000 minutes of music, over a half of a million documents and over 4,000 videos. Since it can hold so much information, you don't have to delete any files to make room on your phone; you can transfer the data and continue to use your phone for downloads and new pictures.

This smartphone USB storage device requires iPhones to have an iOS version 5.0 or higher while Android devices must be version 2.3 or newer. When connecting to your home computer, both PC and Mac setups are accepted. To read the content correctly, the computer must be one of the following editions: Windows XP or newer or Mac OS 10.6 or higher.

To protect your information, this device does not use data encryption or password protection regularly. There is optional password protection over Wi-Fi. It doesn't require an internet connection to function, but it connects wirelessly with up to eight different devices. Your downloaded movies, music and other media can stream to as many as three gadgets at once, which also doesn't require internet access. The USB flash drive for smartphone runs on rechargeable battery power. Any USB 2.0 port restores it to full battery capacity within four hours.

In order to use the USB flash drive for your smartphone, you must download the app from Apple's app store or Google Play, depending on your device. This app lets you organize and transfer your files to prepare them to be used on your computer or other devices. It also allows you to view your images as a slideshow and automatically plays your music once initiated. The application is also available from Amazon's app store.

The smartphone USB storage drive features a one-year limited warranty in the U.S. and Canada. In Europe, the Middle-East, Africa or Asia-Pacific, the warranty is extended to two years.

The SanDisk Connect 32GB wireless flash drive is compatible with a large range of smartphones. However, the need to recharge its battery may leave you without a way to access your information if you are not able to charge it in the middle of viewing your media and documents.

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SanDisk Ultra Review

The SanDisk Ultra 64GB Micro USB 2.0 OTG flash drive is an external storage solution for your Android smartphones and tablets. You can carry roughly 64 gigabytes of extra data with you, without compromising the storage space on your devices.

This pen drive has two connection options: USB or micro USB. This allows the device to connect to your laptop, PC, Mac and any Android, BlackBerry or Kindle device. Micro USB is one of the most popular connection types when it comes to mobile devices. It is not capable of hooking up to your Apple iPhone or iPad without an additional adapter. With this adapter, the drive will function with these devices.

Connecting the device to your PC or Mac computer requires an updated operating system. For computers running Windows, you need Windows XP, 7 or 8. Mac owners should be updated to OS 10.5 and later. The pen drive has plug and play capabilities. As soon as you plug it into your computer or device, it is recognized. It does not require additional software or updates to function.

External storage for Android devices is a practical solution if you need to free up space on your gadgets without having to delete pictures, movies and other files. Once you transfer content to the pen drive, you can plug it into your laptop or PC and transfer the files there. This works in reverse as well, allowing you to transfer documents from your home computer and take them with you on your smartphone or tablet.

SanDisk allows you to manage the content on your flash drive for Android with the SanDisk Memory Zone app. The app is free on the Google Play store and creates menu options on your smartphone for managing and organizing new files. It also has security options that allow you to make certain files private or hidden. The app can create a backup for your phone's memory with one button.

The device's dimensions are 1.4 inches long, 0.8 inches wide and 0.4 inches high. It is about the size of a typical flash drive. It is available in three storage capacities: 16 gigabyte, 32 gigabyte and 64 gigabyte. The 64GB device can hold approximately 80 full-length (2-hour) movies.

The SanDisk Ultra 64GB Micro USB 2.0 OTG is an external storage solution for your Android smartphone or tablet. The SanDisk Memory Zone app supports the device and helps organize and manage your stored files. The drawback is that the device is not compatible with iPhones or iPads without purchasing an adapter cord.

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Sanho Hyperdrive Review

The Sanho Hyperdrive is a specialized drive that features two plug-ins, so it is compatible with the iPhone as well as any computer with a USB port. This allows you to access your data on a range of devices.

Sanho released the iStick Hyperdrive in the summer of 2014 as a double-sided USB drive. One end of the external storage for iPhone has the standard USB 2.0 to connect to your computer or other devices with a USB port. The other side uses the Apple MFi Certified Lightning connector for your iPhone, iPad or iPod. The connectors use a small toggle to switch between the two ends, concealing whichever end is not in use inside the device. Unlike the cloud, it does not require an internet connection to upload or download your media. If you travel on vacation and have your laptop with you, you still have the ability to watch your downloaded videos and listen to music along the way.

This kind of external storage for the iPhone is capable of data transfer between iPhones, iPads, Macs and PCs, allowing for high-speed data transfer for video, photos, documents and music files. It supports a wide range of data file formats including MP4 (videos), GIF (animated graphics), MP3 (music), JPG (pictures), TIFF (other graphics), DOC (Word documents) and DOCX (Word documents). The Sanho Hyperdrive is not compatible with other smartphones, including Android devices.

This smartphone external storage does not offer password protection or data encryption. Since it does not require access to the internet to view your saved files, anyone with a computer can access your information in the event your drive is stolen or lost.

Weighing 10 grams, this flash drive for iPhone is light and small enough to carry in your pocket or purse. Several models are offered to provide a range of storage capacities, starting at 8GB and going up to 128GB. The lower end of the spectrum allows you to store about 2,000 songs or just under 6,000 4-megapixel images. As the information is written, the device transfers at 7.5 megabits per second when transferring from the iStick to the USB-enabled device, taking less than a second to transfer the average song.

The external storage for iPhone comes with a one-year warranty for both parts and labor from the manufacturer but does not cover any damage you do to the device.

The Sanho Hyperdrive is a useful tool for those who want to have access to their iPhone media when it is lost or turned off. However, it is only helpful to those with an iPhone, iPad or iPod since it is not compatible with the port or software inside Android smartphones.

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Seagate Wireless Review

The Seagate Wireless Plus 1TB portable hard drive is designed for use with every type of smartphone as additional storage space. It offers one of the highest levels of storage currently available.

This USB flash drive for smartphones allows you to connect to smartphones and tablets with iOS or Android systems. You can also hook this device up to the Kindle Fire and Windows 8|RT tablets and computers. It accesses up to eight tablets and smartphones at a time, giving you the option to access your information from them or transfer files from them while connected. By creating its own Wi-Fi network, your linked smartphone doesn't need to use data from your local phone plan.

Using the free Seagate Media app, your files are organized by type to help you find them on the sizable storage device. This app is downloadable from Apple's app store, Google Play, the Amazon app store and the Windows store for PC. It allows you to stream your stored movies without internet access or view a slide show of all of your saved pictures. Seagate Central can be downloaded for access to your Facebook photo library as well.

You can connect your computer to the USB flash drive for smartphone via either the USB 3.0 port or wirelessly. It is compatible with both PC and Mac computers with Windows 8|RT, Windows 7, Windows Vista, Windows XP and Mac OS X 10.6 or higher. It uploads your files quicker than the standard Wi-Fi network connection. Files from the cloud, DropBox or Google Drive are also available to upload through this link.

With 1 terabyte of storage space, you are able to load about 17,000 hours of music, 1,000 hours of video, 310,000 images or about 500 hours of movies. Since the smartphone USB storage device works up to 150 feet away, it can be placed anywhere in your vehicle during travel so you and your family are able to access the media of their choosing. With wireless-capable televisions and devices, you can stream your movies directly through newer Blu-ray players as long as you are connected to the Wi-Fi in your home.

Within the box, you receive a USB 3.0 cable, a USB wall charger and information about the limited two-year warranty. In order to access your information from the USB flash drive for smartphone, you must be signed in with your login and password on the application. Beyond that, there is no additional security provided for this device.

The Seagate Wireless Plus 1TB portable hard drive is capable of accessing many devices at once and doesn't require a physical connection for transfers or to read data. However, there is very limited security for your information.

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Sony Review

The Sony 32GB Microvault USB Flash Drive for Smartphone is available in four different sizes to accommodate your growing media collection. It plugs into the micro USB port on your Android device to save your videos, images and other information without using any of your internal storage space.

This smartphone USB storage device is designed specifically for phones with Android operating systems and features connectors on both sides of the device. One side uses a micro USB connector to plug into your Android device while the other side plugs into your computer's USB 2.0 port. Even though it features both ends, you cannot connect to both at the same time. All data must be saved from the first device before being unplugged and connected to the other. A green LED light on the side illuminates when it is properly connected to your computer and ready for file transfers. It is compatible with Windows 8, Windows 7, Windows Vista and Mac OS X 10.4 or later. The USB flash drive for smartphones can be used for smartphone-to-smartphone transfers as well as PC-to-PC transfers.

The USB flash drive for smartphones has a removable cap that protects the micro USB connector from damage when it's not being used. However, the USB 2.0 end does not have a covering, leaving it exposed to potential harm. This side features printed writing on the top side to tell you how much storage space the device allows. It does not require battery power and relies on the connection to your PC or smartphone for activation.

To manage all the information you save on the flash drive for Android, you are required to download the File Manager app from Google Play. This application gives you the ability to search and browse through the saved files on the device and assists in transfers. This software cannot be downloaded onto your PC, meaning that all of the files must be managed through your smartphone. There are no additional security features for this device beyond file management through the application. This means that anyone who plugs in the device has access to your information.

The USB flash drive for smartphone weighs approximately 6 grams, making it a lightweight drive to carry along in your purse or pocket. This particular edition gives you 32GB of storage space, which is approximately equivalent to 8,000 songs, 23,000 pictures or 60 full-length movies.

The Sony 32GB Microvault USB Flash Drive for Smartphone is specially designed for use with new Android devices. This means that older Android devices are not compatible, and neither are Apple products like the iPhone or iPad.

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