It was easy to mount the original iPod and access it liks a USB drive. It's possible to do that with an iPhone, too, although there are different approaches depending on the type of data you want to work with.
In this article we'll explore the different approaches, and they're summarised below:
|PTP||Photos & videos||Built-in to Windows & macOS|
|AFC||Photos, videos, & some apps||iTunes|
|FUSE (no jailbreak)||Photos, videos, & some apps||Free FUSE client|
|FUSE (with jailbreak)||All files||Jailbreak, free FUSE client|
|WebDAV via Filza||All files||Jailbreak, free WebDav client|
|AFC2||All files||Jailbreak, AFC2 plugin, AFC2 client|
|Other||None||Not working on modern iOS|
iOS automatically presents modern devices as cameras when they're connected over USB. This uses Picture Transfer Protocol (PTP) which is a fairly limited system allowing you to copy photos back and forth. You'll probably recognise the
DCIM folders that photos tend to appear in.
PTP has a number of drawbacks: most obviously, you can't access files other than from the camera. And PTP doesn't support functionality such as renaming or modify files or folders: instead, it must delete and recreate them to effect a change. This is slow.
Apple's knowledge-base has an article describing how to manage rudimentary filesharing with iTunes.
FUSE is a system that lets users mount drives on their Windows or Mac computers without needing to make administrator-level changes to their systems. FUSE stands for "filesystem in userspace" and is available in different forms on most platforms. FUSE itself is an abstraction layer, in that it isn't the technology that communicates directly with the device or data source: usually, another approach is used for that. In the case of mounting an iPhone as a drive, FUSE would communicate with the iPhone using another protocol: SSH, AFC/AFC2, PTP or WebDAV. On Windows, the popular Dokan user-mode file system is often used, and on macOS osxfuse is popular.
From a user's perspective, because FUSE normalises the way the device's data is presented, it usually doesn't matter which underlying protocol is responsible for the mount.
Using a FUSE mount on macOS
Let's demonstrate that approach on macOS, and how to mount a device. In order for this to work, you'll need to install the free Homebrew package manager and be familiar with using the macOS Terminal.
First of all, let's find your device's
UDID. You can do this with the free version of iPhone Backup Extractor, with the
lsusb command, or with
ioreg -p IOUSB -l -w 0. Run iPhone Backup Extractor whilst your device is connected, select your device, and choose the "Info" tab. You'll see the
UDID shown in the "Hardware identifiers" section:
Next, let's get FUSE for macOS ready:
$ brew tap homebrew/cask $ brew cask install osxfuse ==> Caveats To install and/or use osxfuse you may need to enable their kernel extension in System Preferences → Security & Privacy → General For more information refer to vendor documentation or the Apple Technical Note: https://developer.apple.com/library/content/technotes/tn2459/_index.html You must reboot for the installation of osxfuse to take effect.
And let's install
ifuse, which is the code that can communicate with iOS devices through FUSE:
$ brew install ifuse
ifuse installed, it's possible to mount your iPhone or iPad using the
UDID we obtained earlier:
$ mkdir ~/iphone $ ifuse ~/iphone --udid 000000000000000000000000
That'll mount your iPhone as a disk on your machine. If you'd like to go further and dig into more data, this Super User post is rather handy, and similarly, this post covers off use of the usbmuxd tool.
The instructions are exactly the same as above. With the device jailbroken, you'll see more data straight away. Neat, eh?
On a jailbroken iOS device, it's possible to install a file manager app named Filza through Cydia. Under Fileza's settings, you can enable WebDAV server mode. This provides a fairly simple interface for other devices to access your iOS device, although it is extremely insecure. WebDAV is a very general mechanism for working with web data, and there are many clients which can access it: including a web interface that's built-in to Filza. Connect to your device with a web browser, and you'll see the interface. Easy.
AFC2 can be install from Cydia, and once installed will allow an AFC client to browse the device in its entirety.
Prior to the release of iOS 8, there were several Cydia plugin for jailbroken devices which would make an iPhone present itself as a USB stick when connected. Alas, there are no longer supported on modern versions of iOS.
Recovering deleted files from a mounted iOS device
If you can mount your iPhone or iPad as a drive, you might think you could recover deleted files by manipulating the filesystem directly on a jailbroken device. Unfortunately, you can't recover files this way from an iPhone as the filesystem is encrypted. Even if you could find bits of the data, you'd not be able to decrypt them. Each file has its own encryption key, and those keys are discarded on deletion.
Apple's iOS Security Guide covers this briefly on page 17 in the "architecture overview":
Every time a file on the data partition is created, Data Protection creates a new 256-bit key (the “per-file” key) and gives it to the hardware AES engine, which uses the key to encrypt the file as it is written to flash memory using AES-XTS mode. On devices with an A7, S2, or S3 SoC, AES-CBC is used. The initialization vector is calculated with the block offset into the file, encrypted with the SHA-1 hash of the per-file key.
Mounting can work well for getting to extant files, but it's not much help for recovery. For that, you either need an iTunes or iCloud backup, data synced with the iCloud, or a forensic image of the device from before the data was deleted.