Missing Bootcamp after resize / Missing operating system

Can you use El Capitan has deleted my bootcamp windows partition as a reference and download Testdisk and GPT Fdisk and start a Testdisk scan?

Press Return/Enter to Continue the Quick Search.

1. Did you select EFI/GPT partition type when you started with Testdisk? If you did not, the displays may look a bit different.

2. This is expected. The list you see first is the list of unrecoverable partitions. If you press Enter/Return to Continue, you should see a list of recoverable partitions. Do not use left/right arrow keys in Testdisk, use only up/down and the 'p' (print) command.

1. Can you post the output of sudo fdisk /dev/disk0 using a different terminal window?

2. Scroll down to the second MS Data (@1161068544) and use 'p' to list files? Do you see a listing similar to the following?

Based on your diskutil list, I assume you are not yet on El Capitan.

Install GPT Fdisk (aka gdisk). Leave your Testdisk display and start a new Terminal Window. You need to use the following steps. If you see any error messages during the following steps, please stop and post back here with the error message. The following steps have values from your Testdisk output (and you can verify) in Steps 7 and 8. Please notice the'+' sign in step 8 (this is called offset notation). The text in parentheses is for informational purpose to describe the action being taken. Gdisk has one-character commands except when entering numbers.

Rebuild GPT4 using start/end offsets

1. Sudo gdisk /dev/rdisk0
2. P (print the full list of parts)
3. D (delete)
4. 4 (part 4)
5. N (new part)
6. 4 (part 4)
7. 1161068544 ( - Start offset in sectors or the start point for Bootcamp part)
8. +304078841 ( - Size offset, as opposed to End offset)
9. 0700 (Windows part type)
10. P (print list of all parts just to see what changes will be made)
11. W (Write the new GPT)
12. Y (Yes! really write the new GPT)

This will delete and re-write the GPT partition info for /dev/disk0s4.

Rebuild MBR to match the new GPT information thus resetting the Hybrid MBR. Use defaults for other questions (like partition codes). The only values that need modifications are the Boot flags and step 10. Accept all other defaults that Gdisk offers. Please see thesample Q&A as an example. These steps can be repeated if you make a mistake before you get to Step 12, otherwise start from Step 1 for these steps. Step 6 has numbers which are typed with a space between the numbers. Please see the sample Q&A before you execute these steps.

1. Sudo gdisk /dev/rdisk0
2. P (Print list of parts)
3. R (Recover)
4. O (print current Hybrid MBR)
5. H (chooses Hybrid)
6. Partitions numbers to be hybridized: 2 3 4
7. Y (Good for GRUB question)
8. N (part 2 boot flag)
9. N (part 3 boot flag)
10. Y (part 4 boot flag make NTFS bootable partition)
11. O (print current Hybrid MBR)
12. W (Write the new MBR)
13. Y (Yes! write the new MBR)
14. Reboot

Here is sample Q&A for this section. Please notice the Press Enter/Return.

Place EFI GPT (0xEE) partition first in MBR (good for GRUB)? (Y/N): Y

Creating entry for GPT partition #2 (MBR partition #2)

Enter an MBR hex code (default AF): Press Enter/Return

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #3 (MBR partition #3)

Enter an MBR hex code (default AB): Press Enter/Return

Set the bootable flag? (Y/N): N

Creating entry for GPT partition #4 (MBR partition #4)

Enter an MBR hex code (default 07): Press Enter/Return

Set the bootable flag? (Y/N): Y

Test 1 - Does Bootcamp Volume show up in Finder?

Test 2 - Can you see files in Bootcamp Volume?

Test 3 - Can you select Bootcamp in System Preferences -> Startup Disk?

Test 4 - If Test 3 is successful, select Bootcamp and Click Restart.

Please post the output of the GPT and Fdisk commands for the record.

1. Do you have any third-party NTFS software (Tuxera, Paragon, NTFS-3g,...)?

2. Winload.exe can be corrected in one of two ways.

a. Use a Windows Installer disc/ISO - https://www.microsoft.com/en-us/software-download/home and build a Installer DVD or USB, as appropriate for your specific year/model of the Mac. Repair Windows Startup.

b. Download Paragon NTFS trial version, copy Winload.exe from the Windows Installer media into the appropriate directory as shown in the error message, and test.

Nuke-And-Pave is always the last resort. Let us try to fix this, before you pursue the N-and-P.

You may not need to repair, if you have the ISO. Open the ISO and extract winload.exe and use the NTFS products you mention to copy it and test. There are also Windows tools like sfc (System File Checker) which can help.

You may want to find the correct Windows version and see if you can run Startup Repair. If this W7, I can upload my W7 Repair Disk to drop box, if that will work for you.