Bootcamp Partition No Longer Mounted

Thanks LonerT for your help. I really appreciate it.

After looking through a few threads, I think I figured out what you were saying. First, I opened Testdisk and selected the default option. Then this screen came up.

I selected the default. Then,

I hit continue. Then,

I selected EFI/GPT since that's what you said in the other post, and it makes sense given that I'm looking for a partition. Then,

I selected "Analyse". Then,

I selected "Quick Search" at the bottom. Then, after about 3 minutes, this came up:

Thanks again.

Haha gotcha. Here's what that did: (The unmount failed the second time but maybe that's to be expected.)

-bash-3.2# diskutil unmountDisk disk0

Unmount of all volumes on disk0 was successful

-bash-3.2# gpt destroy /dev/disk0

gpt destroy: /dev/disk0: Suspicious MBR at sector 0

-bash-3.2# gpt create -f /dev/disk0

gpt create: /dev/disk0: Suspicious MBR at sector 0

-bash-3.2# diskutil unmountDisk disk0

Unmount of disk0 failed: at least one volume could not be unmounted

-bash-3.2# gpt add -i 1 -b 40 -s 409600 -t efi /dev/disk0

/dev/disk0s1 added

-bash-3.2# diskutil unmountDisk disk0

Unmount of all volumes on disk0 was successful

-bash-3.2# gpt add -i 3 -b 714960896 -s 222740473 -t windows /dev/disk0

/dev/disk0s3 added

-bash-3.2# gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=480103981056; sectorsize=512; blocks=937703088

gpt show: /dev/disk0: PMBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 937703087

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 714551256

714960896 222740473 3 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

937701369 1686

937703055 32 Sec GPT table

937703087 1 Sec GPT header

Ok.

-bash-3.2# diskutil repairDisk disk0

Repairing the partition map might erase disk0s1, proceed? (y/N) y

Started partition map repair on disk0

Checking prerequisites

Checking the partition list

Adjusting partition map to fit whole disk as required

Checking for an EFI system partition

Checking the EFI system partition's size

Checking the EFI system partition's file system

Checking the EFI system partition's folder content

Checking all HFS data partition loader spaces

Checking booter partitions

Reviewing boot support loaders

Checking Core Storage Physical Volume partitions

The partition map appears to be OK

Finished partition map repair on disk0

Oh that makes sense, of course. Ok, here's the line of screenshots again. The highlighted options indicate the options I selected (starting with the step after selecting 'Sudo'). I'm not sure if I was supposed to select 'disk0' or 'rdisk0', but I selected 'disk0'.

Then, after about 40 minutes this time, this came up:

Should I hit 'Continue'?

This screenshot is immediately following step 3 in the Rebuild GPT section. Since I only have 3 partitions listed, and the 3rd partition seems to be the one associated with bootcamp, do I enter the number 3 instead of 4, like the other post says?

Ok so just to clarify, you're saying that in the post you mentioned earlier (Re: El Capitan has deleted my bootcamp windows partition), the steps are the same except I enter the number 2 for steps 4 and 6 (instead of the number 4 like that post says), and I enter the numbers you specified for steps 7 and 8 (without the '+' sign)? Do I use the delete command (letter 'd') for step 3?

Then after that, restart the computer in macOS to make sure it's working?

And then if macOS appears to work okay, restart again and try bootcamp?

Thanks.

Oh I see what you're saying. Ok cool. I figured I should be very careful doing this because it sounds like if I make a mistake, I could lose that bootcamp partition. So I went through those steps for the 2nd partition (haven't gotten to the 3rd yet). I stopped before step 12 for now just to be safe.

So I have a couple questions:

1. Do I enter 'y' right here? In other words, if I'm changing BOTH the second and third partitions like you said, do I run through all 12 steps from the other post twice? Or do I stop at step 9 (or some other step) when I'm changing the 2nd partition and then go through all 12 steps with the 3rd partition? It's unclear to me whether I'm supposed to write the new GPT after changing the 2nd partition but before changing the 3rd partition, or if I'm supposed to change both the 2nd and 3rd partitions before writing the new GPT. Hopefully that makes sense.

2. Similarly, do I re-write the MBR to match the new GPT information both times? Do I run through those 14 steps twice, or do I just do those steps once after changing the GPT for both partitions?

Thanks for clarifying.