Level 1

4 points

Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?

Hello, I am fairly new to the iMac and I have to use some programs in Windows that are not available for Mac so I set up Boot Camp and installed Windows 8.1.

My iMac is a I7-2600 CPU @ 3.4GHz with 16 GB RAM, system type-bit. Under system in Windows it shows Installed memory (RAM) 16 GB (2.48 GB usable).

I read about this problem and most answers are related to people using 32-bit. So what is wrong in my case, where is the problem?

Thank you in advance for help and suggestions.

iMac, OS X Yosemite (10.10.3)

Posted on May 3, 2015 11:52 AM

195 replies

Loner T

Level 9

59,606 points

Jun 22, 2015 1:16 PM in response to Mortandos

Yes. Remember, this also requires running SysPrep which has a limited number of attempts due to Windows licensing restrictions.

Mortandos Author

Level 1

4 points

Jun 22, 2015 3:42 PM in response to Loner T

It seems that this is my last option. Any links / documentation that you know of (that are reliable)? Did it work for you?

Loner T

Level 9

59,606 points

Jun 22, 2015 5:41 PM in response to Mortandos

The Winclone is well written and self-contained. If you buy the product, you will also get Technical Support. I have not run into any issues so far.

Loner T

Level 9

59,606 points

Jun 22, 2015 6:59 PM in response to Mortandos

You need to use the --deep qualifier. See man codesign for details.

Mortandos Author

Level 1

4 points

Jun 22, 2015 7:09 PM in response to Loner T

unfortunately I don't know what you're talking about. Is that regarding the terminal command? Can you please post the correct command?

And regarding the question on the Windows laptop?!

Mortandos Author

Level 1

4 points

Jun 23, 2015 1:54 PM in response to Loner T

1) this still results in "Boot Camp Assistant quit unexpectedly." Any idea why?

I'll look in to #2 and #3 later, thank you.

Loner T

Level 9

59,606 points

Jun 23, 2015 3:08 PM in response to Mortandos

Please try

sudo codesign --deep --verbose -fs - /Applications/Utilities/Boot\ Camp\ Assistant.app

Loner T

Level 9

59,606 points

Jun 23, 2015 3:36 PM in response to Mortandos

Can you post the output of the codesign command?

Unless you have a license to install Windows on an external drive, it will not work.

Loner T

Level 9

59,606 points

Jun 23, 2015 5:02 PM in response to Mortandos

I do not have a Mac on which I can install a fresh copy. Can you wait till tomorrow, so I can get a Winclone on a spare Mac?

Loner T

Level 9

59,606 points

Jun 24, 2015 9:56 AM in response to Mortandos

I have had issues in the past with Kingston flash drives. Do you a SanDisk USB flash drive which 8GB or larger?

Loner T

Level 9

59,606 points

Jun 24, 2015 12:16 PM in response to Mortandos

Are you able to create the BC USB on this one?

Mortandos Author

Level 1

4 points

Jun 25, 2015 4:58 PM in response to Loner T

I didn't know that you can't send any PM here, I don't feel comfortable to post the link in a public forum.

Mortandos Author

Level 1

4 points

Jun 29, 2015 10:29 AM in response to Loner T

Any news in the meantime?

Loner T

Level 9

59,606 points

Jul 12, 2015 8:31 AM in response to Mortandos

Mortandos wrote:

Any news in the meantime?

I am unable to find the appropriate hardware to create a Winclone for you. I am still looking.

Loner T

Level 9

59,606 points

Jul 19, 2015 10:10 AM in response to Loner T

@Mortandos

l o n e r t m a c at g m a i l d o t

If you need it.

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Why can I only use 2.48 GB RAM in Boot Camp (Win 8.1 Pro, 64-bit)?