From The Apple Wiki

This folder contains nothing by default. However, if you hook your iPhone up to Xcode, and click the "Use For Development" button, the content of 'DeveloperDiskImage.dmg' gets mounted by /usr/libexec/mobile_image_mounter into here.

Unsigned Code

If you patch out the SecKeyRawVerify from /usr/libexec/mobile_image_mounter, you can get Xcode to upload unsigned DeveloperDiskImage.dmg files. This is because no signature checking is performed by Xcode, not on the device.

AppleInternal Use

In AppleInternal use, /Developer has internal things like Dtrace (as a .kext) and GCC.



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