Enhanced Write Filter

Enhanced Write Filter (or EWF) is a component of Windows XP Embedded and Windows Embedded Standard 7 which stores volume changes on another medium instead of applying them to the original volume.[1] EWF allows the writes to be discarded or committed to the original volume later (either directly or through inaction based on the configuration). As this minimizes writes to a specified hard disk, EWF and FBWF (File-Based Write Filter)[2] have become popular in enthusiast computing as a way of decreasing wear of solid-state drives on netbooks and CarPCs.

## Contents

* 1 Operating modes
* 2 Use in Windows Vista
* 3 Potential pitfalls
* 4 References

## Operating modes

EWF has three main operating modes: EWF Disk, EWF RAM, and EWF RAM Reg. In each mode, the location of the EWF volume (which stores the configuration) and the overlay volume (which stores file changes) is different. EWF Disk stores the overlay data outside the primary disk, allowing an external disk such as a CompactFlash to be used as an overlay. The EWF volume is stored in an unpartitioned space on the disk. EWF RAM stores the overlay data in the RAM and the EWF volume in an unpartitioned space on the disk. EWF RAM Reg is same as EWF RAM except the EWF volume is stored in Windows Registry.

## Use in Windows Vista

As is the case with the appropriation of EWF in CarPCs, which are more often based on Windows XP because of its smaller "footprint," it has been used with similar effect in Windows Vista NetBooks to diminish write activity to, and so enhance the lifespan of solid-state drives (SSD). Due to changes in Windows Vista, however, the Disk Mode can not be used.

## Potential pitfalls

Unlike most commercial RAM disks, EWF cannot reclaim the RAM after files have been deleted from it. In EWF RAM (and EWF RAM Reg) mode, the memory consumed only ever increases. Eventually the system will have no more free space and will crash.[3]

Automatic adjustment of daylight saving time is not compatible with EWF, causing incorrect time settings at each reboot.[4]

## References

1. ↑ Enhanced Write Filter
2. ↑ File-Based Write Filter
3. ↑ EWF RAM Mode
4. ↑ Write Filters and Automatic Adjustment of Daylight Saving Time (Standard 7 SP1)

* v
* t
* e

Microsoft Windows components

Management
tools|

* App Installer
* Command Prompt
* Control Panel
* Applets
* Device Manager
* Disk Cleanup
* Disk Defragmenter
* Driver Verifier
* DxDiag
* Event Viewer
* IExpress
* Management Console
* Netsh
* Performance Monitor
* Recovery Console
* Resource Monitor
* Settings
* Sysprep
* System Configuration
* System File Checker
* System Information
* System Policy Editor
* System Restore
* Task Manager
* Windows Error Reporting
* Windows Ink
* Windows Installer
* PowerShell
* Windows Update
* Windows Insider
* WinRE
* WMI

Apps|

* Alarms & Clock
* Calculator
* Calendar
* Camera
* Character Map
* Cortana
* Edge
* Fax and Scan
* Feedback Hub
* File Manager
* Get Help
* Groove Music
* Magnifier
* Mail
* Messaging
* Maps
* Media Player
* Movies & TV
* Mobility Center
* Money
* News
* Narrator
* Notepad
* OneDrive
* OneNote
* Paint
* Paint 3D
* People
* Phone Companion
* Photos
* Quick Assist
* Snipping Tool
* Speech Recognition
* Skype
* Sports
* Sticky Notes
* View 3D
* Store
* Tips
* Voice Recorder
* Wallet
* Weather
* Windows To Go
* Windows Story Remix
* WordPad
* Xbox Console Companion
* Your Phone

Shell|

* Action Center
* Aero
* AutoPlay
* AutoRun
* ClearType
* Explorer
* Search
* Indexing Service
* IFilter
* Saved search
* Namespace
* Special folder
* Start menu
* Taskbar
* Task View
* Windows Spotlight
* Windows XP visual styles

Services|

* Service Control Manager
* BITS
* CLFS
* Multimedia Class Scheduler
* Shadow Copy
* Task Scheduler
* Error Reporting
* Wireless Zero Configuration

File systems|

* CDFS
* DFS
* exFAT
* IFS
* FAT
* NTFS
* Hard link
* Junction point
* Mount Point
* Reparse point
* Symbolic link
* TxF
* EFS
* ReFS
* UDF

Server|

* Domains
* Active Directory
* DNS
* Group Policy
* Roaming user profiles
* Folder redirection
* Distributed Transaction Coordinator
* MSMQ
* Windows Media Services
* Rights Management Services
* IIS
* Remote Desktop Services
* WSUS
* SharePoint
* Network Access Protection
* PWS
* DFS Replication
* Remote Differential Compression
* Print Services for UNIX
* Remote Installation Services
* Windows Deployment Services
* System Resource Manager
* Hyper-V
* Server Core

Architecture|

* Architecture of Windows NT
* Startup process
* NT
* Vista
* CSRSS
* Desktop Window Manager
* Portable Executable
* EXE
* DLL
* Enhanced Write Filter
* Graphics Device Interface
* hal.dll
* I/O request packet
* Imaging Format
* Kernel Transaction Manager
* Library files
* Logical Disk Manager
* LSASS
* MinWin
* NTLDR
* Ntoskrnl.exe
* Object Manager
* Open XML Paper Specification
* Registry
* Resource Protection
* Security Account Manager
* Server Message Block
* Shadow Copy
* SMSS
* System Idle Process
* USER
* WHEA
* Win32 console
* Winlogon
* WinUSB

Security|

* Security and Maintenance
* AppLocker
* BitLocker
* Credential Guard
* Data Execution Prevention
* Family Safety
* Kernel Patch Protection
* Mandatory Integrity Control
* Protected Media Path
* User Account Control
* User Interface Privilege Isolation
* Windows Defender
* Windows Firewall

Compatibility|

* COMMAND.COM
* Virtual DOS machine
* Windows on Windows
* WoW64
* Windows Subsystem for Linux

API|

* Active Scripting
* WSH
* VBScript
* JScript
* COM
* ActiveX
* ActiveX Document
* COM Structured storage
* DCOM
* OLE
* OLE Automation
* Transaction Server
* DirectX
* .NET Framework
* Universal Windows Platform
* Windows Mixed Reality
* Windows Runtime
* WinUSB

Games|

* Solitaire Collection

Discontinued|

| Games|

* 3D Pinball
* Chess Titans
* FreeCell
* Hearts
* InkBall
* Hold 'Em
* Purble Place
* Reversi
* Spider Solitaire
* Solitaire
* Tinker

|

Apps|

* ActiveMovie
* Anytime Upgrade
* Address Book
* Backup and Restore
* Cardfile
* CardSpace
* CD Player
* Contacts
* Desktop Gadgets
* Diagnostics
* DriveSpace
* DVD Maker
* Easy Transfer
* Fax
* Food & Drink
* Help and Support Center
* Health & Fitness
* HyperTerminal
* Internet Explorer
* Journal
* Media Center
* Meeting Space
* Messaging
* Messenger
* Mobile Device Center
* Movie Maker
* MSN Dial-up
* NetMeeting
* NTBackup
* Outlook Express
* Travel
* Photo Gallery
* Photo Viewer
* Program Manager
* Steps Recorder
* Syskey
* WinHelp
* Write

Others|

* ScanDisk
* File Protection
* Media Control Interface
* Next-Generation Secure Computing Base
* POSIX subsystem
* Interix
* Video for Windows
* Windows SideShow
* Windows Services for UNIX
* Windows System Assessment Tool
* WinFS

Spun off to
Microsoft Store|

* DVD Player
* Hover!
* Mahjong
* Minesweeper

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Enhanced Write Filter. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Software:Enhanced_Write_Filter&oldid=2131507"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template