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Level 1

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My Bootcamp partition disappeared after the Yosemite update.

My Bootcamp partition disappeared after the Yosemite update, in place a partition named disk0s4 appeared. Can someone guide me in recovering this partition?

MacBook Pro, OS X Mountain Lion (10.8.3), Lost Partition

Posted on Apr 1, 2015 7:18 PM

27 replies

Loner T

Level 9

59,471 points

Apr 1, 2015 9:26 PM in response to Haxatax

Quit Gdisk. Run Disk Utility Repair. After the Repair, check with Gdisk again.

Haxatax Author

Level 1

0 points

Apr 1, 2015 9:50 PM in response to Loner T

Disk utility only allowed me to verify disk and Repair disk permissions.

Caution: The CRC for the backup partition table is invalid. This table may

be corrupt. This program will automatically create a new backup partition

table when you save your partitions.

Problem: The secondary header's self-pointer indicates that it doesn't reside

at the end of the disk. If you've added a disk to a RAID array, use the 'e'

option on the experts' menu to adjust the secondary header's and partition

table's locations.

Problem: Disk is too small to hold all the data!

(Disk size is 976773123 sectors, needs to be 976773168 sectors.)

The 'e' option on the experts' menu may fix this problem.

Problem: GPT claims the disk is larger than it is! (Claimed last usable

sector is 976773134, but backup header is at

976773167 and disk size is 976773123 sectors.

The 'e' option on the experts' menu will probably fix this problem

Identified 4 problems!

Loner T

Level 9

59,471 points

Apr 1, 2015 10:05 PM in response to Haxatax

There is another disk editor called cgdisk (Curses-based). You can use it instead of gdisk and take a screen shot/copy of the screen and then scroll to the Quit option and press Enter. Post the screen shot using Grab.

Here is an example from my machine. It may not work, if the GPT is corrupted and it cannot fix it. You may need to us the 'e' option in Gdisk as a last resort.