If you have an iPhone then you don’t need to buy an external drive for a normal use, you can use your iPhone as an wireless drive if computer and iPhone are on same wireless network. Discover is a free app available on the App Store that turn your iPhone into a wireless hard disk and you can access your data from iPhone using Web Browser like Internet Explorer or Firefox or you can use WebDAV protocol to connect to your iPhone via Finder.
Open “App Store” app from your iPhone, Search for “Discover” application and install it. Discover is free app for iPhone.
Run “Discover” app from your iPhone. You will see the following message, note down the address of your iPhone and tap “OK” button.
Transfer files from Windows/Mac
Now on your Windows / Mac computer open up the web browser like IE, Safari, Firefox or Google Chrome and type the address of you iPhone that you have noted down in step-2 and hit the Enter key. If you forgot the address, tap the green light icon in Discover app on your iPhone to see the address.
Select the folder either “Public” or “Private”, click on “Add Files” button and select files that you want to transfer from your computer to iPhone.
All selected files will be listed in Upload Queue section, click the “Upload all” button to start transferring files from computer to iPhone.
You can see all files that you have transferred will be available on your iPhone and you can view the PDF/Image files right in the “Discover” app.
You can setup password to protect the data, tap the Settings icon to see options.
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