Your bootable USB drive could not be created

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Level 1

8 points

Your bootable USB drive could not be created

Hello

I have watched all youtube videos and read as much I found but I'm not able to solve the problem.
I trie to instal W10 to my Imac 27 retina, MacOS High Sierra version 10.13.4, Bootcamp version 6.1.0.

Bootcamp gives me two different errors:
1. An error occurred while formatting the disk.
Or if I try second time then:
2. An error occurred while copying the Windows installation files.

What i have tested:
1. Many different USB sticks (8GB, 16GB, 64GB, all usb3 fast ones)
2. Downloaded different windows files from microsoft webpage (W10 1803, W10 1607, W8.1). I have unmounted iso files, I have created new image (DVD/CD master) and renamed it ISO.
3. ISO file locates on internal drive.
4. I downgrade my mac to Sierra because I have installed windows to macs where was Sierra and i didn't have any problems. Now I'm back to High Sierra.

I'm starting to think that there is something to do with this that I changed 1TB HDD to 1TB SSD. At first in my imac was fusion drive. At the moment i have two different drives, 1TB SSD and 24GB SSD (not used).

Probably it is small stupid thing what I do wrong but I have lost so many hours and days, I would be really thankful if someone can help me 🙂. Thank You !

iMac

Posted on May 18, 2018 2:20 PM

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Answer 1

Top-ranking reply

KarmoG Author

Level 1

8 points

May 22, 2018 1:21 PM in response to Loner T

I reset SMC and NVRAM. After that I run BCA and got the message again "You must have at least 1011 GB of free space available".

On disk utility I found that:
Fusion drive:
Macintosh HD:
device information - size 24GB
but
partition size is 1.01TB

When I try to create any partition bigger than 24GB then it says operation failed.

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Answer 2

Loner T

Level 9

59,536 points

May 20, 2018 3:10 PM in response to KarmoG

KarmoG wrote:

The screen on the left indicates that BCA wants to create a USB installer. You need a USB2 flash drive. BCA will copy the contents of the ISO and BC drivers to the USB. On the previous screen, you should have three options - Create, Download and Install. The Install Option, if enabled, should partition your internal disk and install Windows.

Having said this, your Mac thinks it is a 2014 Mac, not a 2015. Click on About This Mac -> System Report, and post a screen shot, without the serial number being shown on the screen.

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Answer 3

Loner T

Level 9

59,536 points

May 21, 2018 4:15 AM in response to KarmoG

From macOS Terminal, can you post the output of

diskutil list

Your Disk Utility shows two disks - a 24GB and 1TB - which is incorrect. You should have a single 'Fusion' drive. If the Fusion drive was not rebuilt correctly, it causes many issues.

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Answer 4

Loner T

Level 9

59,536 points

May 19, 2018 6:38 AM in response to KarmoG

KarmoG wrote:

iMac (Retina 5K, 27-inch, Late 2015)

Strike this - Can you use a USB2 Flash drive?

On a 2015, you do not need any external storage to install Windows. Please disconnect the all external storage and run a SMC and NVRAM Reset before your next attempt.

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Answer 5

Loner T

Level 9

59,536 points

May 19, 2018 5:07 AM in response to KarmoG

Can you use a USB2 Flash drive? Please run a SMC and NVRAM Reset before you next attempt.

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Answer 6

Loner T

Level 9

59,536 points

May 21, 2018 6:05 PM in response to KarmoG

Can you post the output of

diskutil cs list

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Answer 7

Loner T

Level 9

59,536 points

May 22, 2018 4:10 AM in response to KarmoG

Your Fusion layout is correct. Can you run

diskutil repairDisk disk0

and post the session output?

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Answer 8

Loner T

Level 9

59,536 points

May 20, 2018 5:47 AM in response to KarmoG

KarmoG wrote:

But on the second page I can add ISO image and choose Destination disk (USB). There is no partition area.

Post a screen shot of what you see using Application -> Utilities -> Grab. You will need to save it in a file using Preview and post it as a reply.

KarmoG wrote:

The SSD I changed is Samsung SSD 850 EVO 1TB Media

From macOS Terminal, post the output of

diskutil info /

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Answer 9

Loner T

Level 9

59,536 points

May 22, 2018 12:59 PM in response to KarmoG

Can you run a SMC and NVRAM Reset after disconnecting all external storage, run BCA, connect a USB2 flash drive, only if prompted by BCA, and follow the prompts?

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Answer 10

Loner T

Level 9

59,536 points

May 22, 2018 1:29 PM in response to KarmoG

Using disk utility, can you create a fat partition larger than 24 GB?

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Answer 11

Loner T

Level 9

59,536 points

May 19, 2018 2:02 PM in response to KarmoG

Can you look at Bootcamp User Interface and check which of the three different interfaces are presented to you when you run BC Assistant?

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Answer 12

KarmoG Author

Level 1

8 points

May 19, 2018 11:35 PM in response to Loner T

Hello

The last interface with only difference that there is windows 8 or later.
But on the second page I can add ISO image and choose Destination disk (USB). There is no partition area.

The SSD I changed is Samsung SSD 850 EVO 1TB Media

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Answer 13

KarmoG Author

Level 1

8 points

May 20, 2018 10:46 PM in response to Loner T

On the boot camp first page I have marked all three things (Create, Download and Install)

No changes with usb 2.0

After I changed HDD to SSD I started with recovery mode and it downloaded new OSX.

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Answer 14

KarmoG Author

Level 1

8 points

May 21, 2018 5:02 PM in response to Loner T

I created Fusion drive exactly by instructions. But it looks to me that there went something wrong, because it only lets me create partitions witch are smaller then 24GB (Fusion Drive and Macintosh HD both shows device information: size 24GB, but partition information 1,01 TB)

And boot camp of course say that there is no space.

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Answer 15

Loner T

Level 9

59,536 points

May 24, 2018 9:15 PM in response to KarmoG

Here is an example, which uses the resizeStack command - Re: "We couldn't create a new partition or locate an existing one. Form more information, see setup log files" . It is a slightly different scenario in which I had to pick a specific underlying physical disk to create the BC partition.

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Your bootable USB drive could not be created

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