Cannot access Mac OS Partition from windows 8 running in boot camp

Question

Level 1

1 points

Cannot access Mac OS Partition from windows 8 running in boot camp

So I installed Windows 8.1 Pro through Boot Camp but I can't access the Mac OS partition from windows even though boot camp partition shows up while I'm on Mac OS. I have installed all the drivers from apple but still it didn't work. Then I downloaded Paragon HFS+ which was free for windows 8 and 8.1 thinking that this would solve my problem. The instructions told me to change the drive letter for mac partition from disk management by right clicking the drive pressing "change drive letter and path" button. But the "change drive letter and path" key in grey color and I can't press it. Can somebody please help?

MacBook Pro

Posted on Aug 1, 2014 7:51 AM

Reply

Answer 1

Loner T

Level 9

59,471 points

Aug 1, 2014 8:57 AM in response to inherentmink

Please post the output of the following commands (using OSX Terminal)

1. diskutil list

2. sudo fdisk /dev/<BootCampDisk> (from 1 of the form disk0)

3. sudo gpt -vv -r show /dev/<BootCampDisk> (from 1 of the form disk0)

4. sudo dd if=/dev/r<BootCampDisk>s? < count=1 2>/dev/null | hexdump -C (the exact slice of the form disk0s4)

Reply

Answer 2

inherentmink Author

Level 1

1 points

Aug 1, 2014 9:31 AM in response to Loner T

Here you go

1) diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *750.2 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 650.3 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 99.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *645.8 GB disk1

Logical Volume on disk0s2

AFC82671-CBAA-4338-BAEC-7D272EC755B1

Unencrypted

2. sudo fdisk /dev/<BootCampDisk> (from 1 of the form disk0)

i typed this: sudo fdisk /dev/disk0

Disk: /dev/disk0 geometry: 91201/255/63 [1465149168 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AC 1023 254 63 - 1023 254 63 [ 409640 - 1270110576] <Unknown ID>

3: AB 1023 254 63 - 1023 254 63 [1270520216 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [1271791616 - 193355776] HPFS/QNX/AUX

sudo fdisk /dev/disk1

/dev/disk1: Resource busy

3. sudo gpt -vv -r show /dev/<BootCampDisk> (from 1 of the form disk0)

sudo gpt -vv -r show /dev/disk0

gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168

gpt show: /dev/disk0: Suspicious MBR at sector 0

gpt show: /dev/disk0: Pri GPT at sector 1

gpt show: /dev/disk0: Sec GPT at sector 1465149167

start size index contents

0 1 MBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 1270110576 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

1270520216 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

1271789752 1864

1271791616 193355776 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

1465147392 1743

1465149135 32 Sec GPT table

1465149167 1 Sec GPT header

I didn't quite understand the 4th step. Sorry 😕

Reply

Answer 3

Loner T

Level 9

59,471 points

Aug 1, 2014 9:41 AM in response to inherentmink

It looks like you are using Yosemite Beta not Mavericks, which has additional challenges.

This step should be (it dumps the first block of the Bootcamp disk slice which can show if the NTFS file system is intact or not).

sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C

Reply

Answer 4

inherentmink Author

Level 1

1 points

Aug 1, 2014 11:01 AM in response to Loner T

So this is what i get:

00000000 eb 52 90 4e 54 46 53 20 20 20 20 00 02 08 00 00 |.R.NTFS .....|

00000010 00 00 00 00 00 f8 00 00 3f 00 ff 00 00 00 ce 4b |........?......K|

00000020 00 00 00 00 80 00 80 00 ff 5f 86 0b 00 00 00 00 |........._......|

00000030 00 00 0c 00 00 00 00 00 02 00 00 00 00 00 00 00 |................|

00000040 f6 00 00 00 01 00 00 00 f9 8b 5d 26 a2 5d 26 ce |..........]&.]&.|

00000050 00 00 00 00 fa 33 c0 8e d0 bc 00 7c fb 68 c0 07 |.....3.....|.h..|

00000060 1f 1e 68 66 00 cb 88 16 0e 00 66 81 3e 03 00 4e |..hf......f.>..N|

00000070 54 46 53 75 15 b4 41 bb aa 55 cd 13 72 0c 81 fb |TFSu..A..U..r...|

00000080 55 aa 75 06 f7 c1 01 00 75 03 e9 dd 00 1e 83 ec |U.u.....u.......|

00000090 18 68 1a 00 b4 48 8a 16 0e 00 8b f4 16 1f cd 13 |.h...H..........|

000000a0 9f 83 c4 18 9e 58 1f 72 e1 3b 06 0b 00 75 db a3 |.....X.r.;...u..|

000000b0 0f 00 c1 2e 0f 00 04 1e 5a 33 db b9 00 20 2b c8 |........Z3... +.|

000000c0 66 ff 06 11 00 03 16 0f 00 8e c2 ff 06 16 00 e8 |f...............|

000000d0 4b 00 2b c8 77 ef b8 00 bb cd 1a 66 23 c0 75 2d |K.+.w......f#.u-|

000000e0 66 81 fb 54 43 50 41 75 24 81 f9 02 01 72 1e 16 |f..TCPAu$....r..|

000000f0 68 07 bb 16 68 52 11 16 68 09 00 66 53 66 53 66 |h...hR..h..fSfSf|

00000100 55 16 16 16 68 b8 01 66 61 0e 07 cd 1a 33 c0 bf |U...h..fa....3..|

00000110 0a 13 b9 f6 0c fc f3 aa e9 fe 01 90 90 66 60 1e |.............f`.|

00000120 06 66 a1 11 00 66 03 06 1c 00 1e 66 68 00 00 00 |.f...f.....fh...|

00000130 00 66 50 06 53 68 01 00 68 10 00 b4 42 8a 16 0e |.fP.Sh..h...B...|

00000140 00 16 1f 8b f4 cd 13 66 59 5b 5a 66 59 66 59 1f |.......fY[ZfYfY.|

00000150 0f 82 16 00 66 ff 06 11 00 03 16 0f 00 8e c2 ff |....f...........|

00000160 0e 16 00 75 bc 07 1f 66 61 c3 a1 f6 01 e8 09 00 |...u...fa.......|

00000170 a1 fa 01 e8 03 00 f4 eb fd 8b f0 ac 3c 00 74 09 |............<.t.|

00000180 b4 0e bb 07 00 cd 10 eb f2 c3 0d 0a 41 20 64 69 |............A di|

00000190 73 6b 20 72 65 61 64 20 65 72 72 6f 72 20 6f 63 |sk read error oc|

000001a0 63 75 72 72 65 64 00 0d 0a 42 4f 4f 54 4d 47 52 |curred...BOOTMGR|

000001b0 20 69 73 20 63 6f 6d 70 72 65 73 73 65 64 00 0d | is compressed..|

000001c0 0a 50 72 65 73 73 20 43 74 72 6c 2b 41 6c 74 2b |.Press Ctrl+Alt+|

000001d0 44 65 6c 20 74 6f 20 72 65 73 74 61 72 74 0d 0a |Del to restart..|

000001e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|

000001f0 00 00 00 00 00 00 8a 01 a7 01 bf 01 00 00 55 aa |..............U.|

00000200

Yes, im on yosemite beta. I had parallels desktop 9 first but it doesnt work with yosemite. thats why i decided to use boot camp. If all fails, ill go back to mavericks.

Reply

Answer 5

Loner T

Level 9

59,471 points

Aug 1, 2014 11:59 AM in response to inherentmink

Paragon software can interfere with the setup. If you can uninstall it and do this to make sure it works. You install it later, after you talk to Paragon Tech Support on your issue.

If your Bootcamp works, but you cannot access the OSX partition in the Control Panel -> Bootcamp, it may be an easier fix than what others have.

The Bootcamp side looks at the MBR to decide if it can show you the OSX side or not. In your MBR, the code for OSX is incorrect.

In OSX terminal (you will get a warning for i386 boot that can be safely ignored)...

sudo fdisk -e /dev/disk0

setpid 2

AF

w

p

y

Please post the output of the sequence commands, to ensure there are no other errors. If there are any other errors, stop and post the screen shot here. Please remove any personal information as you see fit.

Reboot and hold the ALT key and choose OSX. Make sure it works. Switch to BOOTCAMP via System Preferences -> Startup Disk.

In BOOTCAMP, Control Panel -> Bootcamp and verify that you can see OSX and then select and Restart and verify that you can get back to OSX.

This is my working dual boot (OSX and BOOTCAMP via CSM-BIOS - not EFI). If you notice the second entry has 'AF' as id, not 'AC' the way you have it.

sudo fdisk /dev/disk0

Password:

Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 1452530904] HFS+

3: AB 1023 254 63 - 1023 254 63 [1452940544 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [1454211072 - 499998720] HPFS/QNX/AUX

Reply

Answer 6

inherentmink Author

Level 1

1 points

Aug 1, 2014 9:33 PM in response to Loner T

I did the above steps and got this in terminal:

i can see "BOOTCAMP windows" and "Macintosh HD" in 'boot camp control panel' in windows and also in 'startup disk' in mac. i can access windows files from mac. I removed paragon from both windows and mac os.

But this did not fix the problem. I cannot assign a drive letter to mac partition in "disk management" on windows. Moreover windows doesn't still load the 'file system' details of the mac volumes.

Reply

Answer 7

inherentmink Author

Level 1

1 points

Aug 2, 2014 4:39 AM in response to inherentmink

So I just installed MacDrive 9.2 and it fixed my problem. I think the paragon software was also the cause of the problem because whenever i boot up mac os, the paragon app crashes.

Now I get full read and write access to Mac Volume.

Thanks for the help!! 🙂

Reply

Answer 8

Loner T

Level 9

59,471 points

Aug 2, 2014 5:26 AM in response to inherentmink

The 'y' and 'w' need to be switched.

Reboot will be required should be 'y'es.

'p' should then print the updated MBR.

Can you post the output of sudo fdisk /dev/disk0?

I am curious as to what MacDrive did to the MBR. Interesting that it costs USD50 for the Standard version.

Glad to see it all work. 😉

Reply