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Update security-considerations-for-a-sql-server-installation.md
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docs/sql-server/install/security-considerations-for-a-sql-server-installation.md

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### <a name="sa_with_least_privileges"></a> Configure a Secure File System
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Using the correct file system increases security. For [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] installations, you should do the following tasks:
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Use the NT file system (NTFS) or Resilient File System (ReFS). NTFS and ReFS are the recommended file system for installations of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] because it is more stable and recoverable than FAT32 file systems. NTFS or ReFS also enable security options like file and directory access control lists (ACLs) and Encrypting File System (EFS) - file encryption. During installation, [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] will set appropriate ACLs on registry keys and files if it detects NTFS. These permissions should not be changed. Future releases of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] might not support installation on computers with FAT file systems.
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Use the NT file system (NTFS) or Resilient File System (ReFS). NTFS and ReFS are the recommended file system for installations of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] because it is more stable and recoverable than FAT32 file systems. NTFS or ReFS also enable security options like file and directory access control lists (ACLs). NTFS also supports Encrypting File System (EFS) - file encryption. During installation, [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] will set appropriate ACLs on registry keys and files if it detects NTFS. These permissions should not be changed. Future releases of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] might not support installation on computers with FAT file systems.
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> [!NOTE]
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> If you use EFS, database files will be encrypted under the identity of the account running [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)]. Only this account will be able to decrypt the files. If you must change the account that runs [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)], you must first decrypt the files under the old account and then re-encrypt them under the new service account.

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