Lesson Mac failed disk space loss after Windows system installation

Originally on the MAC is win10 the recent old prompt to expire the end of the month to stop the free update decided to install WIN8 and then upgrade to WIN10

Because I've had experience with WIN10 before, so it's easy.

Go to Mac first to bootcamp cancel now installed win10 recover disk space

Then download the image of the win8 with the bootcamp installation to separate a 70G of disk space and then normal operation

To Win8 choose to install to disk when the disk is not available next show Gray remember before loading win10 also have this situation then formatted. Look, there's a problem here.

After formatting is still not available, and the hands of the cheap point a bit to delete the partition, and then new, or not available! Nothing can be manipulated now, but it has to be restarted.

After booting to Bootcamp open, click Continue prompt: The boot disk must be formatted as a single "Mac OS Extended (journaled)" volume, or you have already used "boot Camp assistant" to sub-zone to install Windows

Momentary feeling is not right, but before the win10 of the time also happened this situation, so no panic. Open the Disk Management tool as you did before, and find the partition erase merge.

When the disk management opened, dumbfounded. The partition of 70G is not displayed. That is, 70 grams of space are missing on the disk. Not afraid to open the terminal, enter the command:

The Diskutil list lists the disk partitions, or the 70 g spaces that are not disappearing. This is really no recruit from the online search a lot, the following actions were carried out:

Fsck-fy Repair Disk in single-user mode

Recovery mode Disk Utility repair Disk

The above operation did not have any effect, there was no way. Later found a post, there are similar operations. One of them replied that the partition that was formatted during the installation of Windows was restored with the WINDWOS environment, that is, to repartition a drive letter.

Then use a PC to download a PE environment to do a USB flash drive, and then start on the Mac, install the ALT key, choose the production of a good PE environment, after entering the disk management tools, opened, directly saw the idle 70G.

Then use the tool to re-partition the free space to select the type of Mac recognizable. Restart after saving.

(PE environment Here i download is the Chinese cabbage uefi usb boot link: http://www.dabaicai.com/down_131.html)

Normal access to the Mac, can't wait to open the Disk Management tool, finally found the disappearance of 70G space. The disk utility is then used to repartition the merge.

There are some minor problems in the process of merging, but it's a good solution. Attach the resolution process:

diskutil list           List Partition status
diskutil erasevolume hfs+ xx/dev/disk0s3    ' XX ' is the name of the volume, with the change, ' DISK0S3 ' is the number of the  partition you want to delete, the partition table listed above can be found
diskutil mergepartitions hfs+ xx disk0s2 disk0s3   ' xx ' Ibid.,
' Disk0s2 disk0s3 ' Here are two numbers that refer to two partitions, the next one is the partition you want to delete, and the previous one is the partition to which you want to merge the deleted partitions
Restarting the machine using Disk utility to re-merge partitions
execution of Diskutil mergepartitions may be followed by an error without a tube Restart can then use the Disk Management tool to properly partition the merge .

Lesson Mac failed disk space loss after Windows system failure