Error codes

0x000000ED

UNMOUNTABLE_BOOT_VOLUME

What it means

Windows could not open the drive it starts from, usually because of file system errors.

Common causes

• File system damage after a power loss
• A failing drive or loose cable
• A broken update

How to fix it

1. Boot into the Recovery screen > Troubleshoot > Advanced options > Command Prompt and run chkdsk C: /r.
2. Then try Startup Repair from the same menu.
3. Check the drive's health in CrystalDiskInfo from another PC and back up your files if it shows "Caution".