NTFS
A folder must be on NTFS to be encrypted using EFS.
Log files The encrypting file system EFS Disk quotas
Encrypting File System (EFS)
EFS stands for Encrypted File System and is used to encrypt folders and files in Windows XP or Vista.This encryption works ONLY when using the Windows NTFS file system!
Encrypting File System (EFS)
Microsoft EFS stands for Encryption File System. This is used when you want to encrypt and protect your data and personal information from others by using a password.
EFS Encrypting File System
The key difference between EFS (Elastic File System) and EF (Entity Framework) is that EFS is a cloud-based file storage service, while EF is an object-relational mapping framework for .NET applications. If your use case involves storing and accessing files in a scalable and flexible manner, EFS would be more suitable. On the other hand, if you need to work with data in a relational database within a .NET application, EF would be the better choice.
To effectively manage the transition from Elastic File System (EFS) to Elastic File Manager (EFM), it is important to carefully plan and communicate the changes to all stakeholders. This includes assessing the compatibility of existing systems with EFM, training staff on the new platform, and ensuring a smooth migration process with minimal disruption to operations. Regular monitoring and evaluation of the transition process will also help identify and address any issues that may arise.
see http://support.microsoft.com/kb/941674
Found on the ScanState Syntax document at microsoft docs site."Causes the ScanState command to copy the files in the encrypted format. The files will be inaccessible on the destination computer until the EFS certificates are migrated. EFS certificates will be automatically migrated; however, by default USMT fails if an encrypted file is found, unless you specify an /efs option. Therefore you should specify the /efs:copyraw option with the ScanState command to migrate the encrypted file. Then, when you run the LoadState command, the encrypted file and the EFS certificate will be automatically migrated.For example:ScanState /i:migdocs.xml /i:migapp.xml \server\share\migration\mystore /efs:copyrawImportantAll files must be encrypted if the parent folder is encrypted. If the encryption attribute on a file inside an encrypted folder has been removed, the file will be encrypted during the migration using the credentials of the account used to run the LoadState tool. For more information, see Migrate EFS Files and Certificates."
New Technology File System (NTFS) and High Performance File System (HPFS),NTFS supersedes the FAT file system as the preferred file system for Microsoft's Windows operating systems. NTFS has several improvements over FAT and HPFS (High Performance File System) such as improved support for metadata and the use of advanced data structures to improve performance, reliability, and disk space utilization, plus additional extensions such as security access control lists (ACL) and file system journaling. NTFS v3.0 includes several new features over its predecessors: sparse file support, disk usage quotas, reparse points, distributed link tracking, and file-level encryption, also known as the Encrypting File System (EFS).