Depending on the types and number of files that you plan to transfer, different storage amounts may be appropriate. Different files take up a different amount of storage space. If you plan to transfer a large number of high-quality video files, you may consider getting an iPhone USB flash drive with more storage capacity as video files tend to occupy more space. If you only plan to transfer a small number of audio or text files, you may opt for a lower storage capacity iPhone USB flash drive. Some of the different storage amounts available are: