• Runs CHKDSK on the partition containing Windows NT system files. On Intel x86 machines, also runs CHKDSK on the system partition if enabled manually.
• Verifies checksum for installation files is good, If files are missing or corrupt they are restored from the installation disks.
• Replaces the default system and security (SAM) Registry hives when requested.
• Reinstalls Boot Loader (boot sector, HAL, BOOT.INI, NTLDR) upon request

ERD Related Tips:

• NT ERD - never there when you need it
• Contents of NT ERD
• Steps Performed by the Emergency Repair Disk
• Disable a Service or Device that Prevents Windows NT from Booting
• Cracking Windows NT passwords
• Using the Emergency Repair Disk to Fix Windows NT Problems
• Repair Disk Secrets Reduce Downtime
• Patch Available for RDISK Registry Enumeration File" Vulnerability