I resized my partition to increase my Boot Camp drive few months ago with Disk Utility on Mac. After that I decided to have more space on Boot Camp partition. I resized it again by setting a new size for Macintosh HD but when I reboot my Mac and hold alt key there was no Windows boot drive visible. I googled and followed this discussion: Repairing Boot Camp after creating new partition based on this answer. After rebooting my Mac I saw the Windows boot option but after selecting it I get System Operating Missing.
Here is current situation of my partions and disk:
gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168 gpt show: disk0: Suspicious MBR at sector 0 gpt show: disk0: Pri GPT at sector 1 gpt show: disk0: Sec GPT at sector 976773167 start size index contents 0 1 MBR 1 1 Pri GPT header 2 32 Pri GPT table 34 6 40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 409640 850647624 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 851057264 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC 852326800 84899440 937226240 39546880 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 976773120 15 976773135 32 Sec GPT table 976773167 1 Sec GPT header