I downloaded and burnt windows 8.1 from MSDN, but during installation I noticed that when I formatted and deleted particular partitions they won't merge into one as in windows 7 installation (as far as I remember). I had 4 partitions: 50GB 200GB 175GB and 30GB, when I deleted 50 and 30 parts they still stayed as partitions which didn't merge. I want to divide mentioned partitions into 40 GB parts. Extend option was disabled. What did I do wrong ?

Updated with Diskpart info

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    For various reasons, you'll likely need to erase all partitions on the drive to get the end result you're looking for. It's possible that the two partitions that were cleared are not suitably physically situated on the platters to merge, or there could be issues pertaining to the partition table. – dotVezz Dec 20 '13 at 18:05
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    why do you have FIVE partitions??? this is nonsense! – MDT Guy Jan 3 '14 at 14:06
  • @MDTGuy's comment is overly harsh... slightly. Having so many partitions is not very typical due to a lack of necessity in most scenarios. I won't blindly condemn so many partitions without asking why it was ever done. However, the question (of why it was ever done) is worth asking. Of course, this superuser.com question seems to be aiming to reduce the number of partitions (theoretically resolving the concern of an overly complicated layout). – TOOGAM Apr 18 '16 at 2:10
  • You have an extended partition between your logical partitions – Ramhound May 18 '16 at 22:26
  • Logical partitions live inside the extended partition. – wendy.krieger Apr 27 '17 at 9:21

The GUI for Windows Setup is known to be a little goofy, it`s kinda designed to be "easy" to use, but if you know what you're doing its better to use the command prompt to manage the disks with diskpart commands.

Press Shift + F10 during the install to get a command prompt.

EXTEND THE PARTITION TO FREESPACE

See: http://technet.microsoft.com/en-us/library/cc770938.aspx

-or-

ONLY DO THIS IF YOU DONT WANT DATA ON THE DISK

If you don't want any of the data on the local system, just go nuclear, make it easy, clean and wipe the whole disk.

diskpart
list disk
select disk 0
clean
exit

For more info on using DiskPart from the commandline:

http://technet.microsoft.com/en-us/library/cc770877.aspx

  • Thanks, but my problem is that other partitions must stay as they were. I only want to delete 30 and 50 parts, merge them and divide into two parts 40 each. Is it possible somehow to do in command prompt ? – ashur Dec 20 '13 at 17:35
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    Why are you making this more complicated than it needs to be? Messing with multiple partitions is like messing with multiple women, its all fun and games at first, but it all ends very horribly in the end. – MDT Guy Dec 20 '13 at 17:39
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    I'm sorry, but I don't understand what do you mean by that comparison. I simply wanted to resize two partitions during installation, what is wrong with that ? – ashur Dec 20 '13 at 17:43
  • Regardless of what you're trying to do, the command line diskpart command is your best bet if you're having problems with the GUI in windows setup. – MDT Guy Dec 20 '13 at 17:47
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    As you can see, they're not adjacent. You can't do it, not without a lot of data moving, which is almost equivalent to a full delete and remaking of partitions. – Milind R Jan 3 '14 at 9:12

A hard disk drive is a sequential data access drive (its pseudo random). Let's say your hard drive space is divided into ABCDE. This division is sequential i.e. The B partition space comes after A and C after B and so on.

You can only merge two partitions if there are adjacent.

  • These partitions can be merged together: AB, BC, CD, DE, ABC, BCD, CDE,...

If you try to merge partitions which have another working partition between them, they can't be merged together. They will remain as seperate spaces.

If you really want to merge them (say A and C), you can backup your B data to some other disk and merge the whole ABC, and then create partition from that merged ABC. OR you can move your B data to C and merge AB instead.

There is a utility "EaseUS Partition Master", it is a shareware program. But it also does the same thing.

I suggest you leave those partitions as they are. OR if you want, you can backup your drive and make new partitions from scratch.

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