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I have installed dual boot windows 10 /ubuntu 14.04. As I went through the instructions I saw that by having an EFI bios I can only make 4 partitions max i.e 2 for windows ( primary c drive and a system generated one) and now I have 2 for ubuntu (swap and an ext4 ) is it alright if I make more partitions in windows ?

Sumeet Deshmukh
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Alen Thomas Alex
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    If Windows is installed in BIOS boot mode even on newer UEFI hardware, you have to use the 35 year old MBR(msdos) partitioning with 4 primary partition limit. If Windows installed in UEFI boot mode then it has to use the newer gpt partitioning which has a 'soft' limit of 128 partition essentially all primary. If MBR http://askubuntu.com/questions/149821/my-laptop-already-has-4-primary-partitions-how-can-i-install-ubuntu – oldfred Apr 24 '17 at 13:23

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To have more than 4 partitions on harddisk you should create one of those 4 extended. And then in extended create logical partitions.

You can check also here, here, here

Romeo Ninov
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  • can i do it in windows now ? Thanks a lot btw. – Alen Thomas Alex Apr 24 '17 at 11:17
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    @AlenThomasAlex yes you can , by using Easy US partition master, free version will work for you, and if your partition scheme is MBR make sure to convert it to GPT – Sumeet Deshmukh Apr 24 '17 at 11:18
  • @SumeetDeshmukh This is a dangerous advice, just converting a disk from MBR to GPT with installed operating systems will leave the computer unbootable. – mook765 Apr 24 '17 at 11:56
  • @mook765 shit I didn't think about that, guess keeping a different SSD for OS's has made my judgement poor in these matters – Sumeet Deshmukh Apr 24 '17 at 11:58
  • Yeah, extended partition is the key. – Gabriel Sandoval Apr 24 '17 at 12:06
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    @SumeetDeshmukh Don't worry, I just had to comment to prevent an accident for the OP. Also the OP didn't give much information, just that his machine has UEFI, but what is on a disk is a different thing, we should have asked for the partition table type. – mook765 Apr 24 '17 at 12:07
  • Whatever you do, do not use the stock Windows tools to create more than four partitions on an MBR disk, or to manipulate a disk that has extended/logical partitions. Microsoft's tools have had serious bugs in handling such disks for years! Instead, leave empty space on the disk and use Ubuntu's tools to create extended and logical partitions. – Rod Smith Apr 25 '17 at 20:35