Add another partition to 4 partition drive for dual boot

Asus x550ca laptop
Just recovered this to factory settings, Windows 8. 4 Partitions.

I want to add a 100 Gb partition to install W-10, dual booting with the W-8. (Going to upgrade to 8.1)

Somewhere, I seem to remember something that said I can only have 4 partitions.

Any problem?


Hard Drive Partitions
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TemodyPickalbatros, IT ManagerCommented:
From disk mangment right click on the c partition and select shrink
You will be asked about how much space you need to shrink choose 100000 mb
You will get a new partition in raw mode format it and enjoy
It depends.

If it is a GPT disk, you can have more than 4 primary partitions (but extended partitions are no longer supported).

If it is an MBR disk, then you are limited to 4 primary partitions, one of which can be an extended partition, and the extended partition can contain further logical partitions.

GPT disks as disks you boot Windows from are only supported by an UEFI BIOS and 64 bit versions of Windows. If you don't have an UEFI BIOS, you can only boot from MBR disks (secondary GPT data disks are supported).

Looking at your screenshot, though, you have an MBR disk...

PC's that were originally delivered by the factory with OEM Windows 8.x installed, all have an UEFI BIOS, that is a requirement of m$ of it's OEM partners, and so those PC's usually also have a GPT disk provided the 64 bit version of windows was installed.

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cfourkaysAuthor Commented:
Thanks, Temody,
You have no problem with creating a 5th partition???
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Lee W, MVPTechnology and Business Process AdvisorCommented:
You BIOS is not UEFI - you can't.  Create a VM.
Why do you want to dual boot? Just upgrade from Windows 8.x to Windows 10, you don't have to wait long, as it is due to be released on the 29th of July, less than 2 months from now. The upgrade is free for an year. Since an upgrade replaces your old OS, you wouldn't have to dual boot anyway.
cfourkaysAuthor Commented:
It's GPT so that means I can shrink the "C:" ????

rindi, this is a work laptop that I want to be able to show my customers the difference.

Yes, if it is GPT, shrink the partition you want to shrink, then in the free space add a new partition.

Another option though would be to install Windows 10 to a VHD file, then you don't need an extra partition, or follow leew's advice and install a virtual machine of Windows 10. That way you can show your customers the differences between the OS's without having to reboot, and they can see the differences more easily.
cfourkaysAuthor Commented:
You know, rindi, that's maybe a better idea. I put one of the earlier builds, 10049 I think, on the Oracle VM with no problem.

I think I'll try both now that I know I can dual boot.
The laptop has a touch screen that I like to demonstrate also with the metro screen. Which I can't stand, myself.
With Windows 8,x Pro, and if your CPU supports SLAT, you can use Hyper-V which is a feature of Windows 8.x Pro and above. That is a type 1 hypervisor and it's performance should be better than Virtualbox, which is only a type 2 hypervisor. Sometimes though it is easier to use VBox...
Maybe you should give leew some credit too, he was the first to suggest a VM...
Lee W, MVPTechnology and Business Process AdvisorCommented:
The screen shot you presented is not a standard GPT boot drive as recommended by MS and typically created by Windows Setup, as I understand GPT from the above link.  Not sure how/why your system is setup like that.
I agree, that's why also I thought you weren't using a GPT disk. It looks just like a normal MBR setup to me.
Gary CaseRetiredCommented:
"The screen shot you presented is not a standard GPT boot drive as recommended by MS and typically created by Windows Setup, as I understand GPT from the above link.  Not sure how/why your system is setup like that. "

"I agree, that's why also I thought you weren't using a GPT disk. It looks just like a normal MBR setup to me. "

==>  Guys ... you're confusing a GPT disk with one that's set up for a UEFI boot.   In fact, the screenshot shown in the question very clearly shows that it IS a GPT disk.    If it was an MBR disk, the 4th partition would not be a primary partition => it would be a volume inside an extended partition [the picture would show that with a green border inside the blue partition markers]
cfourkaysAuthor Commented:
The laptop was just returned to me from Asus after a hard drive failure while still under warranty. That's the same 4 partition setup as when I first got it.
Normally a GPT disk includes an "efi" partition, which usually is around 300MB or so in size. I can't see that partition in the screenshot.
cfourkaysAuthor Commented:
rindi, look at the 100Gb,

BTW, been hanging around since 2002 and never had 2 Savants, ! Prodigy + an MVP helping me.

Disk Mgmt
OK, that wasn't visible in the first screenshot.
Gary CaseRetiredCommented:
It wasn't visible => but it HAD to be the case, since all 4 partitions are shown as primary partitions.    As I noted before, that would NOT be the case with an MBR disk.
Lee W, MVPTechnology and Business Process AdvisorCommented:

Either you've missed something in your explanation or you are mistaken.  You CAN have 4 primary partitions instead of 3 and an Extended on an MBR disk.  See screen shot below:
Further, in my experience, UEFI systems are very new still.  While Vista *MAY* have supported it and Windows 7 does, the VAST majority of systems are NOT UEFI enabled.  Those that are, at least with Win8 and if I'm remembering correctly Win2008R2 based systems, will automatically make a disk GPT at install.

I think what threw me was the suggestion that the second partition was a recovery partition.  The first is too small to be a Win RE partition and the MSR partition should 128 MB - but there is NO 128 MB partition in this disk (reference the link I provided earlier - which is for Win8, but even the Win7 version says the same -
Gary CaseRetiredCommented:
You can indeed have 4 primary partitions => but WIndows will not create them -- you have to use a 3rd party partition manager to do that.    When you create a 4th partition in Windows Disk Management, it's automatically created as a volume in an Extended Partition.

Since the partition structure shown in the question is clearly a "standard" setup, I didn't think there was much doubt that it was not done by somebody using 3rd party utilities.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Actual, Windows DISK MANAGEMENT will not create them.  Setup could if scripted, I believe and DISKPART most DEFINITELY can.  That's how I did it.  And the asker clearly knows diskpart.
cfourkaysAuthor Commented:
Sorry, forgot all about this one.

I used Partition-Assistant Pro to create the needed partition. Installed 10 OK.
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