Q: Your disk could not be partitioned !

Can you boot into Internet Recovery - OS X: About OS X Recovery - Apple Support - and run Utilities -> Terminal and run

diskutil repairDisk disk0

Post a photo/screen shot, if possible.

Loner, I am on chat with apple support and they are walking me through it.  Thanks for your feedback and help.  I have reviewed many of your other posts.

Please post back with resolution, or if the Tech Support cannot resolve it.

Ok, I did EVERYTHING that was posted so far (also in other threads and boards). Reboot in single user mode and run the repair, reboot in recovery mode and run the repair, reboot in safe mode - successful every time, no errors or anything. I think I have the best-repaired HD ever. Still the same error when running bootcamp. Could not be partioned.

I have a mbp 13' early 2015 with El Capitan. Using a Windows 8.1 ISO I didn't need an external USB stick so far so the USB 2.0 problem didn't occur.

Apple chats won't help - I live in Germany and it seems there are no reasonable Apple employees up in my time zone. THANKS for your time - I'll pay it forward.

Disconnect all external storage and run the following two procedures and retry Windows/BCA?

Reset the System Management Controller (SMC) on your Mac - Apple Support

How to Reset NVRAM on your Mac - Apple Support

If you can post the exact error message, it may provide clues to what the issue may be.