With storage size increasing every year, smartphones are finally reaching levels that make them interesting for other applications as well. My Galaxy Note II ships with 16 Gigabyte of storage which can be expanded further with the use of memory cards.
DriveDroid is a free and paid application for Android devices that allows you to use your phone as a boot drive to boot your PC using ISO or IMG image files stored on the phone. This may make sense in a couple of ways. Maybe you want to have a repair or troubleshooting kit always with you, and since you carry your phone around with you at all times, it makes sense to use it for that purpose.
You can use it stationary as well, for instance if you do not have access to another flash memory stick, or if you need more storage than the one you have offers.
There are a couple of requisites though which I'd like to mention first before you get too excited. The application is compatible with all Android 2.2 and higher devices, and requires root to work. It also uses USB Mass Storage which means that some phones, like the Galaxy Note 2 or the Nexus 10 can't be used even if they are rooted. You also need an USB cable to connect the phone to the PC.
To use DriveDroid do the following:
While Linux seems to be the focus right now, you can also create a Windows installation disc using DriveDroid. The developer has published a tutorial on how to do so for Windows 7.
If you use USB Flash drives or optical discs to take disc images with you at all times, you may want to consider moving those to your phone instead to reduce the number of "things" you carry with you at all times. The program is well designed and should not pose any problems to users. The developer notes that some ISO images may not work correctly at the time of writing.
No information are available if and how the free and paid version of DriveDroid differ from each other.
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