How To Get Osx El Capitan For Reformat Purpose

The following is based on Mac OS X version 10.10.5. However, the steps are suitable for Mac OS X 10.6.8 to 10.10.5. For instructions on how to format a drive in Mac OS 10.11 (El Capitan) and above click here. 10.10 will upgrade the libraries (or you can't test the apps), when you reboot to 10.6 the apps will no longer be able to read the libraries, you won't be able to revert to 10.6 without restoring from a backup – which seems to defeat the entire purpose?

I previously had a Windows 7 32-bit installed on my Mac using Boot Camp Assistant. I recently upgraded it to Windows 10 (followed Microsoft update message), but later after I saw some drivers are missing I searched and found out that Boot Camp doesn't support 32-bit Windows 10. So I tried to remove the whole thing from Boot Camp Assistant and reinstall a 64-bit windows 7. The Boot Camp Assistant said it cannot do it and I tried to delete the content myself from Disk Utility.

After that I created a bootable thumb drive using Boot Camp Assistant, but it didn't restart the system automatically. So, I manually restarted and tried to reinstall Windows 7. It failed, but that is not my issue now. The problem is that I currently lost the Boot Camp partition and don't know what to do. I tried diskutil list and here's the picture: sudo gpt -r show /dev/disk0 yields: and sudo fdisk /dev/disk0: My questions are: • What is EFI partition?

Is it part of Apple product or is it created when I tried to install windows? Should I get rid of it or not?

• Why do I see two equal size 'Apple_Boot' partitions? Is it possible that one belongs to the Boot Camp Windows that was on my system before? • I tried to install Windows on the 4th partition (as you can see), but got the message that said it's a GPT partition style. What is that and what should I do know?

I cannot see this 100 GB partition in Disk Utility, so I can't do anything about it from there. My system is MacBook Pro (13-inch, Mid 2012) on OS X El Capitan version 10.11.3 (15D21). Update 1: I want to (hopefully) have a Windows 7 64-bit on Boot Camp and get rid of all unnecessary partitions. Update 2: Here's what I see when try option key during startup. Also, when I restart my Mac now it goes to a grey screen with nothing in it and stays there. I suppose that is the EFI Boot doing because if I select it myself from the following screen the same thing happens. Update 3: I booted to the internal recovery partition and here are the results: • The OS X Utilities is in version 1.0 (306).

• The mount grep disk0 on a Terminal window in the recovery partition yields: and the result of mount grep disk0 on a Terminal window in the OS X (Macintosh HD) partition is: Update 4: • I used update 4 of David Anderson's answer to eliminate the 'EFI Boot' icon and unwanted booting to it which worked perfectly. • I followed update 5 and 1 to get rid of the two unwanted partitions (i.e. Partitions 4 and 5 in my very first picture).

It worked fine too. Now, diskutil list yields: sudo gpt -r show /dev/disk0 yields: and sudo fdisk /dev/disk0: Update 5: I tried to install Windows 7 64-bit again. This time when I got to the following option screen (after holding down the option key) I selected the Windows option; after following the instructions I got to this page again to do the partitioning: here I can see the missing unallocated space, but still doesn't let me install Windows on it and gives me the same message: I need to somehow make this unallocated space available for my Windows installation, but it seems to be still in gpt partition style. Latest version of gimp for mac. Update 6: When I tried to use Disk Utility to format the unallocated space to add a 'MS-DOS (FAT)' formatted partition it turns out that it still doesn't show the unallocated space. Update 9 Good news, your 'Recovery HD' volume has the correct identifier of disk0s3. So there is nothing to fix.