FileVault and Bitlocker, Windows 10, OSX10.11

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Level 1

13 points

FileVault and Bitlocker, Windows 10, OSX10.11

I'm curious regarding the viability of using FileVault on my OS X partition and Bitlocker on my bootcamp partition. I have tried this previously with apparent success on Windows 8.1 and today tried again with Windows 10, using EFI installation.

I first activated FileVault prior to instilling Windows 10 in Bootcamp. Then once Windows 10 was installed I activated Bitlocker. Both partitions boot and report being encrypted, but I've seen older web descriptions stating that the MBR must be modified to make this setup work, or that Windows must be installed fist.

Here is the diskutil readout of the drive structure (128 GB MacBook Air SSD). Any thoughts are appreciated.

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage Macintosh HD 88.3 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data 31.8 GB disk0s4

5: Windows Recovery 366.0 MB disk0s5

OS X El Capitan (10.11.6), null

Posted on Jul 24, 2016 7:53 PM

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Answer 1

Loner T

Level 9

59,536 points

Jul 24, 2016 8:07 PM in response to Scott98981

MBR is valid on installations which use legacy BIOS installation. What year/model is your Mac?

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Answer 2

Scott98981 Author

Level 1

13 points

Jul 24, 2016 8:11 PM in response to Loner T

MacBook Air 2014. I'm not super knowledgeable about drive configurations, but I thought that EFI based installs don't use MBR, but instead GUID.

Thanks.

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Answer 3

Loner T

Level 9

59,536 points

Jul 24, 2016 8:13 PM in response to Scott98981

Can you

1. Post the output of the following OS X Terminal command. Enter your password when prompted.

sudo fdisk /dev/disk0

2. Switch to Windows, and run msinfo32 and look at BIOS Mode.

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Answer 4

Scott98981 Author

Level 1

13 points

Jul 24, 2016 8:20 PM in response to Loner T

Disk: /dev/disk0 geometry: 14751/255/63 [236978176 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 236978175] <Unknown ID>
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused

Windows BIOS Mode states it is in UEFI mode.

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Answer 5

Loner T

Level 9

59,536 points

Jul 25, 2016 5:25 AM in response to Scott98981

You do not need to change anything in your setup. Please ensure you have good backups. The 2012 and later Macs will support BitLocker and FileVault2 on corresponding Windows and OS X partitions, as you have them.

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Answer 6

Scott98981 Author

Level 1

13 points

Jul 25, 2016 5:25 AM in response to Loner T

Thank you so much for your help. This is great to know.

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