The System Reserved partition – contains Boot Configuration Database (BCD) and the boot manager. Size: often ~500 MB.
If you are looking at this in Disk Management and see a small "System" partition, do not delete it.
When you install Windows on a clean disk, the installer sets aside a small amount of space—typically between 100MB and 500MB—before creating the main C: drive. This is labeled as Partition 1. It serves two primary purposes: drive 0 partition 1 system
Use Disk Management , right-click the partition, select "Change Drive Letter and Paths," and click Remove . This hides the drive without deleting the data. 3. Partition is Missing or Corrupted
On computers using UEFI (rather than the older BIOS), this partition holds the bootloaders for the operating system and is essential for starting the computer . When you install Windows on a clean disk,
| Term | Meaning | |------|---------| | | The first physical hard drive (or SSD) detected by the system. Drive numbering starts at 0. | | Partition 1 | The first division or section on that drive. Partitions are numbered starting from 1. | | System | A special partition type containing boot loader files (like bootmgr or EFI files) that start Windows. |
You will see .
| Attribute | Detail | |-----------|--------| | | First partition on first physical disk | | Role | Stores boot loader and startup configuration | | Label | "System" in Disk Management / DiskPart | | Formats | FAT32 (UEFI) or NTFS (System Reserved) | | Hidden by default | Yes (no drive letter) | | Safe to delete? | No – will break boot |
💡 Always keep a system image backup. Since Partition 1 is so small, it is easily overlooked, but losing it is just as disruptive as losing your entire C: drive. If you're dealing with a specific error code, let me know: Are you getting a "Bootmgr is missing" error? Are you stuck in a Windows Update loop ? Did the partition suddenly appear in your file explorer? This hides the drive without deleting the data