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I have recently upgraded to the El Capitan Beta, which has caused a conflict with the Windows 8.1 Bootcamp installation on my MBP (see my previous question: Is it possible to Bootcamp Windows 8.1 using USB on Late 2011 MBP?).

At startup, the option to boot from Windows is no longer available, and the partition has become invisible on Disk Utility.

I am running 10.11 build 15A225f

/dev/disk0 (internal, physical):
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    0:      GUID_partition_scheme                        *500.1 GB   disk0
    1:                        EFI EFI                     209.7 MB   disk0s1
    2:          Apple_CoreStorage Macintosh HD            250.1 GB   disk0s2
    3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
    4:       Microsoft Basic Data                         30.6 GB    disk0s4
/dev/disk1 (internal, virtual):
    #:                       TYPE NAME                    SIZE       IDENTIFIER
    0:                  Apple_HFS Macintosh HD           +249.7 GB   disk1
                             Logical Volume on disk0s2
                             IDIDIDIDIDID
                             Unencrypted
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  • 1
    Please edit your post to include the build of El Capitan you run with this issue
    – bmike
    Aug 12, 2015 at 17:33
  • Hi Mike. I've included the build.
    – Ryan
    Sep 6, 2015 at 17:19
  • I wish I had another upvote. What does diskutil list show you for the partition status. I'd love to help, but I'm in the dark how to proceed quite yet.
    – bmike
    Sep 6, 2015 at 17:22
  • There are two disks: /dev/disk0 (internal, physical) and /dev/disk1 (internal, virtual) - the former has a Microsoft Basic Data partition with no name, a size of 30.6GB and identifier of disk0s4. This probably isn't useful, but I'm not sure what info to provide.
    – Ryan
    Sep 6, 2015 at 17:52
  • Sorry, I think I increased the size of the partition, so the second one: 0: Apple_HFS Macintosh HD +249.7 GB disk1 Logical Volume on disk0s2 ID-HERE-NOT-SURE-IF-SAFE TO-SHARE Unencrypted
    – Ryan
    Sep 6, 2015 at 17:53

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