The iPhone can already be used as a storage device. You just have to connect it to iTunes to sync your files and do other neat things with it. Thanks to the HyperDrive iFlashDrive, you get to transfer files between your iOS device and computer easier. This is not only a USB flash drive, it also connects to your iOS device’s 30 pin connector to transfer files. You are going to need the free iFlashDrive app to get the most out of this.
The iFlashDrive acts as a regular USB drive when it is not connected. It is available in 8, 16, and 32 GB capacities. It will cost you at least $111 though.