NEC Express5800 Series Installation Manual page 22

Chapter 1 Installing Windows
If the partition size for installing Windows is smaller than the recommended size, expand the partition size
or add another hard disk drive.

When installing using Assisted option
Tips
22
Windows is installed using the entire disk space of the hard disk drive. The Windows
OS creates two partitions at the head of the hard disk drive.
— EFI System Partition (ESP):
Microsoft Reserved Partition (MSR):
—
228 MB of disk space is allotted to the two partitions at the head.
Microsoft Reserved Partition (MSR)
(128MB)
EFI System Partition (ESP)
(100MB)
*1 May be 300MB in size depending on hard disk drive type.
*2 MSR is not displayed on Disk Management.
Express5800/R110j-1 Installation Guide (Windows)
Installing Windows Server 2016
100MB *1
128MB *2
System Partition
*2
*1