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Windows 7: Can't mount the fourth partition

28 Aug 2011   #1

Windows 7 Ultimate x64
Can't mount the fourth partition

I don't know if I am in the right place but I am going nuts trying to mount an unallocated space in my Windows 7 partition running on my macbook pro. Yes I know this is a Windows forum and I mentioned Mac, but I really want some help. I partitioned my Samsung 500 Gb in this manner:
65 GB - OSX
65 GB - Windows 7
20 GB - Ubuntu
350 GB -Shared through all my Os's.
The issue here is that, Windows 7 cannot mount my 350 GB partition, and when I go to disk managment, it shows it as unallocated space. I formatted the 350 GB to ntfs, but still it cannot mount it. Can anyone please help me with this situation. Also when I right click on the 350 Gb partition, it gives me the option to change the partiton to a dynamic disk, and I want to evade that. All I want is the 350 GB partition to come up in My Computer, please help. I provided some pictures to see if anyone can use them to help me out.

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Can't mount the fourth partition-disk.png  
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My System SpecsSystem Spec

28 Aug 2011   #2

Windows 8.1 Pro RTM x64

You can only have a maximum of 4 primary partitions on a single HDD/RAID array in Windows. I see that you already have 4 (they're the ones coloured in blue).
My System SpecsSystem Spec
28 Aug 2011   #3

Windows 7

I had this problem too when I bought my first Apple Mac. What Dwarf said is true.

I see you don't have a genuine Mac but if you did, genuine Macs use a partitioning scheme called GUID which supports up to 128 primary partitions (but not extended partitions). However, although Windows works with the GUID partitioning scheme, it works by pretending that it's a traditional MBR scheme. The MBR scheme supports only 4 primary partitions, any one of which can be an "extended" partition.

The good news is that OS-X works perfectly well with the older MBR style partitioning scheme. So if your scheme is MBR, you should delete Ubuntu and turn all the subsequent free space into an extended partition. You should then be able to re-install Ubuntu and successfully create your shared partition. You'll need to reconfigure your boot loader too, of course. But note that this is ONLY possible with an MBR partitioning scheme. Even though it supports more partitions, you can't achieve what you're trying to achieve with the GUID scheme.
My System SpecsSystem Spec

28 Aug 2011   #4
Microsoft MVP

W 7 64-bit Ultimate

Hello elnenebruto, welcome to Seven Forums!

If you do decide to temporarily remove Linux, I would suggest a partition-specific wipe of those partitions to over-write the Grub loader which may still cause serious boot issues; have a look at Method Four of this first tutorial linked below.
Secure Erase / Wipe : Definition and Methods

Then Method One of this shows how to create an Extended partition where you want one.
Partition / Extended : Logical Drives

My System SpecsSystem Spec
28 Aug 2011   #5

Windows 7 Ultimate x64

Thanks guys for all your help, Ima try what ever you guys said to make this work. I'll keep you guys posted on my results
My System SpecsSystem Spec
28 Aug 2011   #6
Microsoft MVP

W 7 64-bit Ultimate

Do remember to post back here with updates or if you need further assistance.
My System SpecsSystem Spec
29 Aug 2011   #7

Windows 7 Ultimate x64

Hello everyone once again!!!!
I almost got what I wanted to do work. Still though I cannot see my 350 GB partition in my computer but it says that it is active in my Disk Management. Here is what I did:
First Partition - 350 GB Shared Volume (Where all 3 Os's will share common media files)
Second Partition - Mac OSX
Third - Windows 7
Fourth - Ubuntu
I partitioned all these using Disk Utility in the OSX. If you need more info on what I did please ask me and I'll tell.

Attached Thumbnails
Can't mount the fourth partition-capture.png   Can't mount the fourth partition-where.png  
My System SpecsSystem Spec

 Can't mount the fourth partition

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