Windows 8 and 8.1 Forums


inquiry before partitioning drives

  1. #1


    Posts : 8
    8.1 Single Language

    inquiry before partitioning drives


    good day! first time to post here.. I finally gave windows 8 a go from sticking to windows 7 machines mainly because the new laptops today come with windows 8

    my question is, I'm planning to repartition my drive to C, D & E (current setup is 372gb for c and 537gb for d).. as always, I'll be using easeus partition manager but before proceeding with the partition, I've read some articles on windows 8 and some say that the OS "details" reside on a "hidden partition" and that if I repartition it, it will mess up the genuine status when I will reformat the PC in the future.. I checked my HDD partition and there is around a 100gb missing so I'm guessing that's the "hidden partition"? can anyone provide insight to this?

    ps. sorry if this has been posted before. I actually tried to do a search before posting but could not find one so I opted to post it.

    thanks!

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  2. #2


    Posts : 1,121
    Windows 8.1 x64


    You might attach a Disk Management picture for us. It is easier to see the properties of your system that way.

    Did you get a new laptop, and does it have Windows 8 or 8.1, they are different OSes, technically.

    If you use EaseUS, make sure and use the latest one and let us know if it messes up your Recovery partitions. In the past it has, but may have be repaired by now.
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  3. #3


    Posts : 8
    8.1 Single Language


    Quote Originally Posted by Saltgrass View Post
    You might attach a Disk Management picture for us. It is easier to see the properties of your system that way.

    Did you get a new laptop, and does it have Windows 8 or 8.1, they are different OSes, technically.

    If you use EaseUS, make sure and use the latest one and let us know if it messes up your Recovery partitions. In the past it has, but may have be repaired by now.

    I forgot to mention it is a new laptop and an 8.1 machine.. I did not know 8 and 8.1 are different OSes.. attached is a snip of the disk management

    thanks!
    Attached Thumbnails Attached Thumbnails partition.JPG  
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  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    FYI, in computer world we use base 2 so everything is multiple of 2 ie., 1, 2, 4, 8,16,32 etc...
    From the screen shot I can see that you have a 1TB hard drive but it only show 931.9 GB. Here's more info on HD:
    HDD's - the Advertized size vs the Actual size. - Windows 7 Help Forums
    There's only a 128MB (not 100GB as stated) missing from the screen shot and cannot be seen from disk management. You need to use diskpart from the command prompt to see it. This missing 128MB is currently unallocated and reserved by MS.

    From the screen, the 100MB partition contains the UEFI Boot Info (BCD), the 900MB is a recoverry partition and contains info to allow you to boot the system into a safe mode and also info to perform system recovery from the 20GB factory recovery partition as if you just bought the PC. As long as you don't mess with these hidden partitions then you should not have any problem. So it is OK to repartition the C: & D: Drive. However, when you perform the factory restore, it will reset everything to the way it is shown now.
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  5. #5


    Posts : 8
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    Quote Originally Posted by topgundcp View Post
    FYI, in computer world we use base 2 so everything is multiple of 2 ie., 1, 2, 4, 8,16,32 etc...
    From the screen shot I can see that you have a 1TB hard drive but it only show 931.9 GB. Here's more info on HD:
    HDD's - the Advertized size vs the Actual size. - Windows 7 Help Forums
    There's only a 128MB (not 100GB as stated) missing from the screen shot and cannot be seen from disk management. You need to use diskpart from the command prompt to see it. This missing 128MB is currently unallocated and reserved by MS.

    From the screen, the 100MB partition contains the UEFI Boot Info (BCD), the 900MB is a recoverry partition and contains info to allow you to boot the system into a safe mode and also info to perform system recovery from the 20GB factory recovery partition as if you just bought the PC. As long as you don't mess with these hidden partitions then you should not have any problem. So it is OK to repartition the C: & D: Drive. However, when you perform the factory restore, it will reset everything to the way it is shown now.
    I said around 100gb based on the devices and drives overview (my bad).. based on what you said, 900mb is already set to the system recovery.. my plan is, partition the drives to C, D & E, install my programs and create a system image.. if in the future anything goes wrong, I can go back to the point after I partitioned the drives and installed my programs without having problems with validating my laptop? windows 7 was easy for me, just type the code printed on the sticker.. windows 8 is new to me hence the questions..

    thanks for the patience!
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  6. #6


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    based on what you said, 900mb is already set to the system recovery.
    No, 900mb partition only contains code to access and restore from the 20GB partition which is the Windows Backup image from the factory.

    BTW, there's no E: drive from the disk management.
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  7. #7


    Posts : 8
    8.1 Single Language


    Quote Originally Posted by topgundcp View Post
    based on what you said, 900mb is already set to the system recovery.
    No, 900mb partition only contains code to access and restore from the 20GB partition which is the Windows Backup image from the factory.

    BTW, there's no E: drive from the disk management.
    I'm planning to repartition the drives. I like separating D (for my personal files) and E (for videos and other stuff). That's why I opened a thread because I'd like to clarify if I might mess something up when I'll repartition them
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  8. #8


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    As said above, if you don't mess with the Hidden partitions then you are OK.
    So for example: your C is currently = 372.60 GB, Your D is = 537.80GB
    Let's say you want to shrink C drive to 100GB (Which is plenty for Windows 8 OS) that will give you an extra 272.60 GB + 537.80GB from D drive which would be 272.60 GB + 537.80GB = 810.4 GB for storage and you can make 2 new partitions D & E and it is up to you how you want to allocate the space for D & E.

    So the final layout is:
    100mb Boot (Hidden)
    900mb Windows Recovery Partition (hidden)
    100gb C: Drive
    400gb D: Drive =====> change size to what you want
    410.4gb E: drive =====> the rest from 810.4 - the size of D
    20GB Factory Recovery partition (hidden)
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  9. #9


    Posts : 879
    Windows 10


    If you have an OEM PC that came with Windows 8/8.1 preinstalled, you may not use the third-party partition software (for example, EaseUS Partition Master), because modifying the hard drive partition structure usually break the factory restore feature. But if you use Windows Disk Management to shrink the C: partition (see screenshot below), then Refresh and Reset should work.

    EDIT: This program does not break the factory restore feature: Free Partition Manager - AOMEI Partition Assistant Standard

    Click image for larger version

    You can verify the Windows RE information (before and after you have used the Windows Disk Management), in the elevated command prompt, type: reagentc /info

    Click image for larger version


    Here is info about reagentc /info -> link
    Last edited by genet; 23 Jun 2015 at 16:28.
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  10. #10


    Posts : 8
    8.1 Single Language


    thanks for the input! did I do it correctly?
    Attached Thumbnails Attached Thumbnails Capture2.JPG   Capture.JPG  
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