FSLogix Terminology

Terms and acronyms used in FSLogix may not always be easy to understand or decipher. The terminology page helps clarify terms and / or acronyms used within our documentation and product.

Term	Definition	Other Names
Back port	The process of taking new product changes or bug fixes and integrating into previous versions. FSLogix doesn't back port any changes or fixes to previous versions. All changes are only available in future releases.
BCDR	Business continuity and disaster recovery are concepts that aim to ensure a particular service or resource is continually available during disaster.	DR
BSOD	Refers to a Windows fatal error or system crash. The term stands for "blue screen of death" due to the error screen during these fatal errors was blue and required a full system restart.	Crash, System Crash
Base disk	Refers to the backing VHD used when ProfileType = 3 or VHDAccessMode = 1, 2, or 3. Differencing disks are merged into base disks.
CCD	Refers to the FSLogix Cloud Cache feature.	Cloud Cache
Container	The virtual hard disk (VHD / VHDX) file, which contains all the data for the given type of container.	Disk
Differencing disk	Refers to the intermediate VHD used to track changes to the base disk. Differencing disks are merged into base disks.
HA	High availability is a concept that aims to ensure a particular service or resource is available during an unplanned outage.
Healthy	Indicates a fully working state of a remote storage provider when using Cloud Cache.
ODFC	A type of container that holds only data and settings for Microsoft 365 products. ODFC data includes, but isn't limited to Outlook, Teams, OneDrive (Personal or Business), and Sharepoint.	Office
Profile	A type of container that holds the data and settings for users signed into a Windows based system.
Redirection	Redirection is a technical concept where a known location (file system or registry) can be pointed to another. The redirection, either to a local disk (mounted or fixed) or network location, will operate / act as if the location exists on the local drive. A known location like, C:\Users\%username%, and all its contents are pointed to the mounted container. Any data in the container is saved for use on other sign-ins.	Redirect
SMB	Stands for "Server Message Block." SMB is a network protocol used by Windows-based computers that allows systems within the same network to share files. An SMB file share is written using \\<server-name>.contoso.com\<share-name>.	CIFS
Storage provider	The service or resource providing container storage. Includes legacy physical storage and Azure based storage. Storage providers are limited by the types of storage FSLogix supports.	VHDLocations, CCDLocations
UNC	Stands for "Universal Naming Convention". UNC is a way to identify a share location on a server without knowing the exact storage device it is on. Windows uses the following UNC format: \\<server-name>.contoso.com\<share-name>
Unhealthy	Indicates a non-working (connectivity, permissions, etc.) state of a remote storage provider when using Cloud Cache.
VHD(x)	A virtual hard disk that provides a 'disk-in-a-file' abstraction.