WiFi HD Wireless Disk Drive is a free application developed by Savy Soda Pty Ltd that allows you to turn your iPhone into a wireless external hard drive. This app lets you share, copy and backup your files to and from your PC, Mac, Linux, or another phone using any WiFi connection. The app is easy to use, and all you need to do is connect your iPhone to a WiFi network, start the WiFi HD app on your phone, and use any device browser to go to the designated IP address.

This app comes with several features, including built-in HTTP and SMB file servers, which work flawlessly with Windows or Mac like a normal network drive. You can manage folders, handle unlimited file sizes and an unlimited number of files, and host NAS folders. The app supports several protocols, such as FTP, HTTP, CIFS, SAMBA, SMB, DropBox, Microsoft One Drive, Google Drive/Docs, and iCloud. However, the built-in web browser only supports downloading PDFs and documents; media files are not supported.