Boot camp format problem

Its an iMac late 2015, and the newest downloaded ISO file windows version 10.

Yes I see the scree with the partitions.

if I select the format - and then format the partition - now to a NTSF format, then windows installer comes with and information, that it can't find the drive or couldn't make a new partition. It all stops here......

I do understand that.....

But when I select to format the Bootcamp partition, then it would do that ok.... but after the formating, and when I select the same, now new formatted part, then windows refuse to install on that partition... saying, can't find the drive or couldn't make a new partition!!!!

Here it normally would start the actual installation......

I have no other drive connected, than the USB drive, who contains the windows ISO file and the Bootcamp help software.....

I see other has exactly same problem.

Could it be a software fail on that software your BCA download from Apple, when the USB is created????

The ISO is located on my Imac.

I have one of the mentioned models, but that doesn't make any difference to the Bootcamp, it is still asking for a USB flash drive.

All functions 100% ok, until windows setup restart the iMac and the setup process take over. Now this process doesn't format the Bootcamp in NTSF format, so the process stop - because it cannot install on a MSFAT32 format.

If you then format, as you are asked to, then the partition now will be in NTSF format, but when you continue on NEXT, windows setup inform, that it can't find a drive to install at and it also can't make a partition........ thats where it all stop.

I think, that the setup software, who is downloaded from Apple is somehow corrupted.....

I have done this many times before, and never had any problems.......

I can only think, that it is the install software which BCA download down to your USB flash.....

I had the iMac by an authorized Service partner Yesterday for 5 hours..... they have done over 200 bootcamps, but never see any problem like this...

I have done a few one, all without problems.

They think, that it is a Fusion drive software problem........ and would like to install a SSD ram drive and kill the Fusion drive......

hi again, and thanks for the help...

I was getting ready to screendump the hole process for you, and while doing this, that must be number 35 time I do this in the last week, it all went well.

I moved onto to taking picture with my mobil, after setup did take over, and when I did a format this time and then press the "next" - suddenly windows started to install on the partition.

Dont ask me why....... I can still only think, that this time the downloaded software hasnt been corrupted....

I have no other explanation.....

But thanks for your interest in helping.

Henrik.

Have already done that.......Yesterday....

Henrik