If you installed Windows 7 Operating system on a new hard disk you might have observed that Windows 7 creates a 100MB system reserved partition. You may have wondered why this partition is created. Well, let’s know more about it:
A Windows 7 System Reserved Partition is a partition that is created while installing Windows 7 on a new hard disk or a formatted hard disk. Usually, it’s a 100MB NTFS partition. If you have a look at it in Disk Management, you’ll notice that it has no Drive letter.
The system reserved 100MB partition is only available for Windows 7 Ultimate, Windows 7 Business and Windows 7 Enterprise editions. It is used primarily as BitLocker partition for BitLocker encryption. In addition to this it also holds the Windows Recovery Environment (WinRE) and boot files with boot manager. This is used to boot the computer whenever it has boot problems and there is no Windows 7 installation DVD disc with you.