Bootcamp Partition Size Issue

Last login: Sat Dec 23 19:09:28 on console

--Mac-mini:~ -$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 499.2 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

--Mac-mini:~ -$

--Mac-mini:~ -$ diskutil list

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *500.1 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 249.9 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s5

4: Microsoft Basic Data U 249.2 GB disk0s4

--Mac-mini:~ -$

here is after doing the FAT partition

alexeyka_1999 wrote:

The same issue. Have spent hours to google this problem and find a solution. Will wait for an official fix.

Create a FAT partition using Disk Utility, create a hybrid MBR using GPT Fdisk, boot from the Windows installation DVD and choose the FAT partition created via Disk Utility. W10 is not officially supported on a 2010 Mac.

Thank you. Will try this solution.

Earlier i have tried to install Windows via Boot Camp Assistant on it's partition as is (it shows 48 gb max possible on my clean 1tb hdd). The additional problem was that when i boot from USB Flash with Windows setup and try to install it on Boot Camp partition (on this clean 1tb drive) it shows that it is impossible. ("Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.").

Could you please suggest some solution?

jasonb12 wrote:

( Just an observation: One of the things I noticed is the Sierra installer & BC Assistant would report/recognize my full hard drive size (2TB) but the High Sierra installer & BC Assistant would always report it as 1.8TB. High Sierra seems to store its recovery partition differently then Sierra, creating a separate hidden 200GB recovery partition. Perhaps the Boot Camp Assistant can't see past / choose the correct partition in its partitioning tool, and it's trying to split up the already full, hidden 200GB recovery partition by mistake? But what do I know?? Fix it, Apple!! )

There is a known issue with High Sierra that BC Assistant does not correctly merge disk space, if a Remove/Restore operation is attempted, leaving the disk space in the existing separate Recovery HD, even though APFS also has a Recovery part.

I take it Apple has not come up with a fix for this as ive just tried myself to use and still the same issue with only having 2 options of partition size. Maybe apple doesnt want us installing windows anymore ! 😐

See Create a bootable installer for macOS - Apple Support .

W10 is not officially supported on a 2010 Mac. What is the issue with W7 64-bit?

Can you run a SMC and NVRAM Reset and retry BCA? Post the output of

diskutil list

diskutil apfs list

diskutil cs list

Does 'Divide Equally' work properly?

Are you able to create a FAT partition of the size you want using Disk Utility?

in disk utility yes.

Please create a FAT partition and post the output of

diskutil list

What is the year/model of your Mac? Do not post the serial number of your Mac?

Which FAT do you want ExFAT or MS-DOS FAT.
mac mini 2012 Late