Q: Boot Camp Partition not mounting
I resized (made larger) my boot camp partition using a 3rd party tool in Windows. Everything is fine, except I can no longer mount the boot camp partition from os/x. I can access the os/x partition from Windows. I can boot to both. When I look at the disk utility, it shows the "original" size of the boot camp partition, not the newly increased size. Additionally, the name of the boot camp partition is no longer "BOOTCAMP" and the disk utility doesn't have any info about the partition being NTFS, etc. There must be someplace that os/x is getting the partition info from and perhaps that can be edited/corrected?
Thanks
iMac 27" (mid 2011)
Yosemite (10.10.3)
iMac, Windows XP
Posted on Jun 3, 2015 8:11 AM
If you notice there is large gap between GPT 3 and GPT4 and your MBR is out of sync with the GPT. OSX reads the GPT, not the MBR, Windows is reversed.
If Windows is currently working as expected, please download GPT Fdisk - http://sourceforge.net/projects/gptfdisk/ and install it. 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 MBR output (and you can verify) in Steps 7 and 8. Your MBR is the source for these two values. Please notice the '+' sign in step 8. The text in parentheses is for informational purposes and is not entered. Most commands in Gdisk are one-character only and values are numeric with the '+' sign, if necessary.
Rebuild GPT4 using start/end offsets
- Sudo gdisk /dev/rdisk0
- P (print the full list of parts)
- D (delete)
- 4 (part 4)
- N (new part)
- 4 (part 4)
- 1760004096 - Start offset in bytes (start point for Bootcamp part)
- +193519616 - Size offset (as opposed to End offset)
- 0700 (Windows part type)
- P (print list of all parts just to see what changes will be made)
- W (Write the new GPT)
- Y (Yes! really write the new GPT)
This will delete and re-write the GPT partition info for /dev/disk0s4.
Reboot and test.
Posted on Jun 3, 2015 9:49 AM
