Tonight I was syncing my iPad and all I wanted to do was add one film to it. During the sync, iTunes crashed with an error message that there was insufficient disk space (there wasn't, my iTunes library is on an external hard drive which is only half full). When I tried again to sync, I found that most of my music and about half my apps had disappeared from the iPad and from iTunes. I don't know where it has all gone, and it seems to be random what has gone (some recent stuff but some music that I have had in iTunes for years). I am now restoring the iPad from a previous back up but it is from 10 days ago and I fear I will have lost some data. This is taking absolutely ages (it has been saying half an hour to go for half an hour!). Any idea what I have done and how to put it right? Is it redeemable?