- Nov 16, 2013
This may help:...
I was going by this definition of the /data partition, from some online docs I've been reading:
"Also called userdata, the data partition contains the user’s data – this is where your contacts, messages, settings and apps that you have installed go. Wiping this partition essentially performs a factory reset on your device, restoring it to the way it was when you first booted it, or the way it was after the last official or custom ROM installation. When you perform a wipe data/factory reset from recovery, it is this partition that you are wiping".
Without getting too technical, userdata encompasses all user data (apps, settings, plus your internal storage). Data contains only apps and settings. Data is found within userdata, so if you wipe userdata you wipe everything (apps, settings, photos, music, etc). If you wipe data your apps and settings are wiped, but not your photos, music, etc.