[SOLVED] Accidentally deleted EFI System Partition on MacBook Pro Yosemite

[Maximillian_1]

While I was downloading windows 10 onto my MacBook Pro using bootcamp I accidentally deleted my EFI System partition. When I try and start up my computer a symbol pops up (a circle with a dash through it). When trying to repair the disk in disk utility my computer says "This disk doesn't contain an EFI System partition. If you want start up your computer with this disk or include it in a RAID set, back up your data and partition this disk." I don't have my data backed up and want to fix my computer. What can I do to get it working again while still keeping all my data? Thanks.

 

[McHenryB]

Plug in an external disk and install OS X on it. Then you can boot from that disk and create a backup of your internal disk.