NEC Express5800 Series Installation Manual page 23

Chapter 1 Installing Windows
Windows Server 2022 Hyper-V support
― ―
Using BitLocker
― ―
 When installing using Manual Installation
Tips
When creating a partition, Windows OS creates the following partitions at
the hard disk drive
— EFI System Partition (ESP)
— Microsoft Reserved Partition (MSR)
— Recovery Partition
For example, when 61,440MB is specified for partition size, the area available
free area is calculated as follows:
61,440MB - (100MB + 16MB + 602MB) ＝ 60,722MB
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.
*3 Partition size differs according to used OS installation media.
If you install by Backup DVD-ROM, the partition is created at 602MB.
Refer to the following web site for information related to Windows Server 2022 Hyper-V.
https://www.58support.nec.co.jp/global/download/w2022/hyper-v/hyper-v-ws2022.html
If using BitLocker, note the following.
 Be sure to keep the recovery password secure. Do not keep it near a server running
BitLocker.
Important If the recovery password is not entered, the OS cannot be started, and the
content of the partition encrypted by BitLocker cannot be referenced any
more. The recovery password might be required at startup of the OS after
the following:
Replacement of motherboard
—
Change of BIOS setting
—
— Initialization of trusted platform module (TPM) *
* Depending on your system, it may not be supported.
Refer to the Instruction Manuals about hardware.
 To reinstall the operating system into a partition that is encrypted with BitLocker, delete the
BitLocker-encrypted partition prior to reinstallation.
Installation Guide (Windows Server 2022)
3. Installing Windows Server 2022
: 100MB *1
: 16MB *2
: 602MB *3
Recovery Partition : 602MB
System Partition
Microsoft Reserved Partition (MSR): 16MB
*1
Free area
*3
*2
23