What is system reserved partition?
In Windows 10/8/7, you can find out that there is a system reserved partition without
a drive letter in your disk. This partition was generated when you select
unallocated space to install windows operating system (OS). The size of this
partition is 100 MB in Windows 7, 350MB in Windows 8/8.1, and 500MB in Windows 10.
Someone receives the error message saying We
couldn’t update the system reserved partition while trying to upgrade to
Windows 10/8. That is because the system reserved partition has no enough space.
To avoid such error, you can extend the system reserved partition before upgrade.
Basically, this partition contains boot files including Boot, System Volume
Information, bootmgr, BOOTSECT.bak, and $RECYCLE.BIN. Therefore, you can see that
this small partition is important.
Can you delete system reserved partition?
When your start up your computer, the Windows Boot Manager will begin to read files
from the partition to load Windows. Once the partition was created, you cannot
simply delete it without causing trouble. If you need to reduce the number of
primary partitions, the system reserved partition should be your last choice to
delete. To delete this partition requires very complicated operations, which are not
confirmed by Microsoft. Therefore, it is recommended to leave it be if it has been
created since it only takes a small amount of space. The appropriate way to get rid
of this partition is to stop it from being generated.
How to get rid of the system reserved partition?
To prevent this partition from being created, you have to select an existing
partition on the hard drive to install Windows. Therefore, you have to create a
partition before installing OS. there are 2 ways that you easily can manage. You can
choose one of them that suits you.
Extend system reserved partition
1. When you boot Windows installation disc to install Windows on an empty disk
(without partitions), you will be prompted to create additional partitions for
system files. Just click “OK” to proceed.
2. Now you can see there are two partitions on the disk. Select the Partition 2
(system partition) and then Click “Delete”. Click “OS” to confirm in the next pop
3. In a moment, the Partition will become unallocated space. Select the system
reserved partition and click “Extend” to extend the partition with the unallocated
4. Click on “format” to format system reserved partition. Then you can select this
partition to install Windows.
Besides using Windows Setup to merge these two partitions, you can also create a partition with Diskpartbefore installing Windows. To access Diskpart before Windows install starts, you can
press Shift + X to open command prompt.
Create partition with third party software
If you need to more advanced options for creating partitions, you can use free partition manager software AOMEI
Partition Assistant. Before you do, you need to create a bootable disk with AOMEI
Partition Assistant on other computer running Windows.
1. Boot your computer that needs installing Windows from the
AOMEI bootable media you have created.
2. Right click on the unallocated space, and then select “Create
3. In the pop out windows, specify the size, location and other
parameters of the new partition. The click “OK” to continue.
4. Preview the partition layout before making any changes to
your hard disk. If you are satisfied with the results, click “Apply” to apply the
When a system reserved partition is created, you can also use this free software to
extend or move system reserved partition without data loss.
Compared with Windows built-in utility, this freeware gives you a more intuitive
interface with more options regarding creating partitions. With either of these
methods, the system reserved partition will not be allowed to be created.
Besides, if you want to use advanced features such as allocate free space, convert
dynamic disk to basic, convert primary partition to logical, you can try AOMEI Partition
Assistant Professional. If you're a server user, AOMEI
Partition Assistant Server could be the one. And you can also use Quick
Partition feature to quickly create partitions with the pre-set or