I ran iDefrag last night because my MBP was running sooooo slow. I barely ever use it and it has 300 GB of free space. I used to use OnyX to optimise the disks on Snow Leopard but I didn't see that option in Lion. I let iDefrag run and went to sleep. This morning I woke up to the Do Not Enter sign and the spinning thing below it. I made sure I left it plugged in so I don't understand what happened.
I booted into recovery and tried to run the disk utility but the repair failed. I tried to reinstall Lion but the drive can not be mounted. I'm currently downloading Lion onto a USB Drive, but now I'm thinking 16 GB won't be large enough to migrate my data like this guide shows: http://www.thomasverbeek.com/blog/?p=183
Am I even going about this correctly? I don't even know if the drive will be mountable once it's done downloading. I just don't want to lose the files on my desktop.