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When trying to update to El Capitan (from Yosemite), I get the following error, and cannot proceed with the installation.

This partition map modification would make a Windows partition unbootable

I have Windows installed with Bootcamp. Here is the disk:

/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            180.0 GB   disk0s2
   3:         Microsoft Reserved                         134.2 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                70.2 GB    disk0s4
   5: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC               471.9 MB   disk0s5

There are no CoreStorage logical volume groups.

Is there anything I can do other than wipe the whole thing? What might cause this?

  • Do the random numbers and letters happen to be DE94BBA4-06D1-4D40-A16A-BFD50179D6AC? – David Anderson Oct 1 '15 at 16:44
  • @DavidAnderson Yes they do, so that would mean it's some kind of a Windows recovery thing? Didn't realize what that was, got caught by the habit of anonymizing every hash etc. – Roope Oct 1 '15 at 17:53
  • When the diskutil does not recognize a partition type, it will present the GUID. A table describing GPT types is given at this link. – David Anderson Oct 1 '15 at 18:05
  • @DavidAnderson Windows Recovery Environment it is, then. Anyway, any suggestions on how to solve the problem? – Roope Oct 1 '15 at 18:08

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