Can not start up and the utility disk first aid failed

I have an iMac 27 "retina 5K (end of 2015) El Capitan (10.11.2) and 10 Windows via Bootcamp.   This morning when I had finished work on the Windows of the machine side, I tried to start in El Capitan, but it failed silently and turned off the machine itself about the 2 minute point.  I tried new and same problem.  So I checked if I could go back to Windows and ran 10 Windows without problem.  Then I started in the Mac recovery partition to run disk utility and it revealed a considerable number of errors on the Macintosh partition such as:

-Previous ID in a string of hard link is incorrect (ID =-1130612101)

(it should be 3164355194 instead of 0)

Several of the above errors appeared with different numbers

-Volume bitmap minor meds of repair for orphans blocks

-County of block free invalid volume

-Volume header needs minor repairs

-Lack of notice of thread (id =-1130634630)

Several of the above errors appeared with different numbers

Finally the process 'done' with the 'first aid process has failed.  If possible to backup the data on this volume.

Then I started in an installed USB version of the El Capitan, and while it was successful, he launched a warning when he mounted the volume that I had the problem with: "OS X cannot repair the disk"Macintosh HD"" but I was able to copy the files from this volume and even run applications that have been stored on it.  Tried to run disk utility and first aid in vain as above.

So here are the questions.

1 should I guess that nothing can do otherwise erase that partition and reinstall El Capitan?

2 delete the partition and reinstalled El Capitan will affect my Bootcamp partition or the ability to use Win 10?

3. I have a Time Machine backup. restore it re - will present the same problem?

4. I have never had such a massive and unrecoverable failure on a Mac drive and I had used it the day before without problem.  Should I assume that the drive itself is defective and have it replaced?  I ran an Apple Hardware Test and were not problems.

1 fix

2. Yes

3 NO.

4 NO.

Back up all data on this disc, including your Bootcamp partition.

Tags: Mac

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