Windows 2000 File Permissions Between FAT32 and NTFS

When moving data between FAT32 and NTFS volumes, Microsoft Windows 2000 relies on the fundamental capabilities of each file system to determine how file permissions are handled. Because NTFS supports granular Access Control Lists (ACLs) and FAT32 does not support native file-level security, Windows 2000 cannot preserve security descriptors symmetrically. Consequently, copying from NTFS to FAT32 strips all existing permissions, while copying from FAT32 to NTFS assigns default permissions inherited from the target folder.

The Structural Difference Between NTFS and FAT32

NTFS utilizes Discretionary Access Control Lists (DACLs) stored directly within the file system metadata. These descriptors define exactly which users and groups have read, write, execute, or administrative rights over a specific file or folder.

In contrast, the FAT32 architecture lacks any mechanism for storing security attributes or user-based permissions. It only tracks standard DOS attributes, such as Read-Only, Hidden, System, and Archive. Because there is nowhere in the FAT32 file allocation table or directory entries to record an NTFS security descriptor, security enforcement changes dramatically during cross-filesystem operations.

Copying from NTFS to FAT32

When a user copies a file from an NTFS volume to a FAT32 volume:

  1. Permission Stripping: Windows 2000 reads the data stream from the NTFS source and writes it to the FAT32 destination. Because the destination cannot store an ACL, Windows 2000 discards the security descriptor completely.
  2. Access State: Once placed on the FAT32 drive, the file is accessible to anyone who has access to that drive or share. There is no user-level restriction applied at the file system level.
  3. Attribute Preservation: Only basic file attributes (such as Read-Only or Archive) are carried over to the FAT32 target.

Copying from FAT32 to NTFS

When a user copies a file from a FAT32 volume to an NTFS volume:

  1. Permission Inheritance: Because the source file on FAT32 has no permissions to preserve, Windows 2000 creates a new security descriptor for the newly created file on the NTFS drive.
  2. Target Folder Rules: The new file automatically inherits the permissions configured on the target parent folder. If the destination folder grants Full Control to the "Everyone" group or restricts access to "Administrators," the copied file assumes those exact rules.
  3. Ownership Assignment: The user account performing the copy operation automatically becomes the owner of the newly created NTFS file, unless an administrative process explicitly dictates otherwise.

Cross-System Enforcement Rules Summary

  • NTFS to FAT32: ACLs are discarded; files become unprotected by file-level security.
  • FAT32 to NTFS: ACLs are created fresh; files inherit permissions from the destination container.
  • Standard Copy Rule: In Windows 2000, any copied file is technically a brand-new file on the destination drive, meaning it will always adopt the security structure natively supported by the target location.