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Windshadow99 Author

Level 1

34 points

More boot camp problems new 5k imac 3 tera fusion drive

there seems to be problems with Yosemite and boot camp assistant

i'm cross posting this to the iMac forum but I spent hours online with apple tech today and none of the several foks I talked to there had even seen a 5k 27" yet and my call back from Cupertino and engineering is no till tomorrow so I thought I should post here too

MMy bto 5k shipped from China sunday night and arrived in Maine this morning.... Amazing when you think about it for a bto

iinstallation and set up we're going fine and I started up boot camp assistant to create a temp boot camp while I wait for my thunder bay 4 box to take the drives for my old Mac pro when boot camp will have a1 tera SSD all to itself....

so carved off a 700 gig boot camp partition which the assistant formatted fat I then plugged is the lighting to FW adapter in a LaCie 2 tera fw 800 drive to act as a bridge to my LaCie DVD burner which uses the old fw400 cables and inserted my new shrink wrap win 8.1 retail 64 DVD and up comes the win 8 install in very tiny type in a tiny window which got a bit of a laugh out of me.

And I go through it to the point of selecting that boot camp partition and then said it could not use a fat partition and I should reformat it from the win 8.1 installer which I did and then it said it could not use and unknown partition so I said great and booted back to 10-10 and the boot camp tool to put things back and it said it could not I then went to disk tools and it also said the 3tera fusion could not be either reformatted or put back to a single partition I was on with tech support where I went up through 4 levels of support due to the 5k bto which most had no knowledge of. We tried the optioncommand r to get to DT and the same problem as did going to reinstall from the net which after a 30 min down load could not reformat either it is now kicked to Cupertino with a call back tomorrow

( At this point all I want to do is put the computer back in the condition it was in when i started with a plain Yosemite on an unpartitioned 3 tera fusion... Then deal with boot camp when it can have its own drive)

am betting it will take a Unix comand line to reformat but be aware there may be boot camp issues with my configuration

and any help here will be great fully received

iMac, OS X Yosemite (10.10)

Posted on Oct 21, 2014 4:04 PM

Top-ranking reply

Loner T

Level 9

59,513 points

Posted on Oct 21, 2014 6:04 PM

There is a much easier and cleaner method on the new iMac 5K, because it is a full UEFI machine and Windows 8.1 is UEFI compliant. The traditional bootcamp Hybrid MBR is a travesty on such a beautiful machine.

Please see this thread - Re: Problem installing Windows (7, 8.0, 8.1) on BOOTCAMP - Mavericks.

Initializing the internal disk may not be necessary at all but Command+Opt+R and DU is needed, if you really need to initialize the internal Fusion HD.

This thread can help you initialize the internal drive - Re: Can't format former Boot Camp partition

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138 replies

Loner T

Level 9

59,513 points

Nov 4, 2014 10:35 AM in response to fredz85

GPT#5 looks like a Windows RE. Are you able to install W8.1 via EFI. You may also end with a MSR partition.

fredz85

Level 1

11 points

Nov 4, 2014 10:59 AM in response to Loner T

Why would the Recovery Environment (RE) be bad? And the MSR? Should I not have both?

I installed Windows 8.1 this morning, same result. To me this seems full GPT/EFI, but not to you?

EDIT: in Windows I get this. There is a star under GPT in "list disk".

DISKPART> list disk

Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 931 GB 0 B *

DISKPART> list volume

Volume ### Ltr Label Fs Type Size Status Info
---------- --- ----------- ----- ---------- ------- --------- --------
Volume 0 C WINDOWS NTFS Partition 464 GB Healthy Boot
Volume 1 EFI FAT32 Partition 200 MB Healthy System
Volume 2 NTFS Partition 450 MB Healthy Hidden

Loner T

Level 9

59,513 points

Nov 4, 2014 11:05 AM in response to fredz85

It looks good. I do not see any issues. The EFI being a volume not a partition is a bit different.

On my rMBP Late 2013 (15") the GPT looks like the following. GPT4 is MSR, GPT5 is Microsoft Data. I am running 64-bit W8.1.

gpt show: /dev/disk0: mediasize=500277790720; sectorsize=512; blocks=977105060

gpt show: /dev/disk0: PMBR at sector 0

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

gpt show: /dev/disk0: Sec GPT at sector 977105059

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

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

409640 487712920 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

488122560 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

489392096 32

489392128 262144 4 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE

489654272 487450624 5 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

977104896 131

977105027 32 Sec GPT table

977105059 1 Sec GPT header

Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]

Signature: 0xAA55

Starting Ending

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

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

1: EE 1023 254 63 - 1023 254 63 [ 1 - 977105059] <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

More boot camp problems new 5k imac 3 tera fusion drive