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the rest of the file to become misaligned to the original content) the blocks used for comparison are not based on static arbitrary cut points but on cut points defined by the contents of each file segment. This means that if a part of a file changes in length, or blocks of the contents get moved to other parts of the file, the block boundaries for the parts that have not changed remain fixed related to the contents, and thus the series of fingerprints for those blocks do not change, they just change position. By comparing all hashes in a file to the hashes for the same file at the other end of the replication pair, RDC is able to identify which blocks of the file have changed and which have not, even if the contents of the file have been significantly reshuffled. Since comparing large files could imply making large numbers of signature comparisons, the algorithm is recursively applied to the hash sets to detect which blocks of hashes have changed or moved around, significantly reducing the amount of data that needs to be transmitted for comparing files.
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136:(BDC), which is designed to operate only on known versions of a single file, RDC does not make assumptions about file similarity or versioning. The differences between files are computed on the fly, therefore RDC is suitable for efficient synchronization of files that have been updated independently, where network bandwidth is small, or where the files are large but the differences between them are small.
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file, MSRDC.DLL, which will be present in the %SYSTEMROOT%\System32 directory if and only if RDC is enabled. Very little software is available which makes use of it, particularly on non-server systems. According to
Internet rumor, enabling RDC significantly slows local file transfers, and it should
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The algorithm used is based on fingerprinting blocks on each file locally at both ends of the replication partners. Since many types of file changes can cause the file contents to move without other significant change (for example, a small insertion or deletion at the beginning of a file can cause
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Later versions of
Windows support cross-file RDC, which finds files similar to the one being replicated, and uses blocks of the similar files that are identical to the replicating file to minimize data transferred over the WAN. Cross-file RDC can use blocks of up to five similar files.
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125:) is a client–server synchronization algorithm that allows the contents of two files to be synchronized by communicating only the differences between them. It was introduced with Microsoft
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R2, is included with later
Windows client and server operating systems, but by 2019 is not being developed and is not used by any Microsoft product.
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Microsoft TechNet: DFS Replication: Frequently Asked
Questions, section "What is cross-file RDC?", pub. 16 October 2006, updated 30 January 2013
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web page disputes this in great detail, despite frequent anecdotal posts of its removal having worked to restore transfer speeds.
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179:(which may be removed from a future update), with the comment "This support isn’t currently used by any Microsoft product".
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Remote
Differential Compression (aka rsync algorithm for Windows), David Jade, Programming, 15 February 2013
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protocol, but with some useful innovations, in particular the recursive algorithm and cross-file RDC.
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Optimizing File
Replication over Limited-Bandwidth Networks using Remote Differential Compression
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RDC is implemented in
Windows operating systems by a
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106:Learn how and when to remove this message
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1930:Next-Generation Secure Computing Base
291:About Remote Differential Compression
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44:adding citations to reliable sources
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177:Features we’re no longer developing
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55:"Remote Differential Compression"
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119:Remote Differential Compression
31:needs additional citations for
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332:Microsoft Windows components
1416:Windows Subsystem for Linux
1375:Mandatory Integrity Control
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926:Wireless Zero Configuration
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1094:Network Access Protection
713:Remote Desktop Connection
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230:Ned Pyle (26 June 2009).
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873:Windows XP visual styles
134:Binary Delta Compression
1920:Media Control Interface
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1134:System Resource Manager
1114:Remote Desktop Services
1109:Print Services for UNIX
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501:Windows Error Reporting
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286:Distributed File System
236:Microsoft Technet blogs
2085:Windows administration
1900:Desktop Cleanup Wizard
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1177:Desktop Window Manager
1069:Windows Media Services
1528:Windows Mixed Reality
1199:Enhanced Write Filter
1049:Roaming user profiles
2080:Data synchronization
1809:Mobile Device Center
1759:Health & Fitness
1557:Solitaire Collection
1385:User Account Control
1380:Protected Media Path
1284:Server Message Block
1234:Logical Disk Manager
486:System Policy Editor
471:System Configuration
40:improve this article
1955:Virtual DOS machine
1299:System Idle Process
1274:Resource Protection
1182:Portable Executable
1074:Active DRM Services
476:System File Checker
446:Performance Monitor
173:Windows Server 2019
127:Windows Server 2003
2090:Windows components
1960:Windows on Windows
1684:Backup and Restore
1496:Transaction Server
1214:I/O request packet
1054:Folder redirection
723:Speech Recognition
481:System Information
436:Management Console
159:not be enabled; a
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791:Action Center
789:
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734:
731:
729:
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724:
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719:
718:Snipping Tool
716:
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576:Character Map
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569:
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429:
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417:
414:
412:
409:
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402:
399:
397:
396:Control Panel
394:
392:
389:
387:
386:App Installer
384:
383:
381:
375:
369:
366:
364:
361:
357:
354:
352:
349:
348:
347:Architecture
346:
344:
341:
340:
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319:
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294:
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263:. 21 May 2019
262:
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71:
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60:
57: –
56:
52:
51:Find sources:
45:
41:
35:
34:
29:This article
27:
23:
18:
17:
2014:File Manager
1854:Photo Viewer
1789:Media Center
1749:Groove Music
1679:Address Book
1650:
1643:
1636:
1631:Purble Place
1629:
1622:
1615:
1608:
1601:
1596:Chess Titans
1594:
1587:
1574:Discontinued
1562:
1555:
1254:Ntoskrnl.exe
1162:Boot Manager
1154:Architecture
1118:
1044:Group Policy
936:File systems
836:Saved search
743:Sticky Notes
708:Quick Assist
636:Media Player
606:Feedback Hub
601:Fax and Scan
496:Task Manager
426:Event Viewer
406:Disk Cleanup
265:. Retrieved
260:
251:
239:. Retrieved
235:
225:
214:
203:
176:
170:
153:
146:
142:
138:
131:
122:
118:
117:
102:
96:January 2010
93:
83:
76:
69:
62:
50:
38:Please help
33:verification
30:
2029:Minesweeper
1998:Spun off to
1819:MSN Dial-up
1814:Movie Maker
1719:Diagnostics
1669:ActiveMovie
1411:COMMAND.COM
1289:Shadow Copy
1144:Server Core
984:Mount Point
911:Shadow Copy
506:Windows Ink
2074:Categories
2009:DVD Player
1824:NetMeeting
1724:DriveSpace
1589:3D Pinball
1089:SharePoint
853:Start menu
698:Phone Link
561:Calculator
516:PowerShell
377:Management
195:References
66:newspapers
1804:Messenger
1799:Messaging
1729:DVD Maker
1699:CD Player
1694:CardSpace
1645:Solitaire
1345:BitLocker
1340:AppLocker
974:Hard link
863:Task View
841:Namespace
811:ClearType
631:Messaging
616:Magnifier
581:Clipchamp
556:3D Viewer
2048:Category
1925:MS-DOS 7
1910:ScanDisk
1829:NTBackup
1709:Contacts
1689:Cardfile
1624:Hold 'Em
1603:FreeCell
1449:VBScript
1360:Defender
1328:Security
1314:Winlogon
1269:Registry
883:Services
816:Explorer
801:AutoPlay
688:Paint 3D
673:OneDrive
663:Narrator
611:Get Help
566:Calendar
461:Settings
431:IExpress
183:See also
2024:Mahjong
1945:Interix
1879:WinHelp
1779:Journal
1769:Imaging
1617:InkBall
1503:DirectX
1466:ActiveX
1454:JScript
1167:Console
1139:Hyper-V
1034:Domains
858:Taskbar
831:IFilter
806:AutoRun
768:WordPad
763:Weather
678:OneNote
668:Notepad
591:Cortana
466:Sysprep
132:Unlike
80:scholar
2057:
2046:
2019:Hover!
1893:Others
1874:Travel
1869:Syskey
1652:Tinker
1610:Hearts
1538:WinUSB
1523:WinAPI
1508:Native
1319:WinUSB
1244:MinWin
1021:Server
821:Search
733:Sports
703:Photos
693:People
571:Camera
267:2 June
241:2 June
82:
75:
68:
61:
53:
1985:WinFS
1884:Write
1581:Games
1548:Games
1421:WoW64
1249:NTLDR
1239:LSASS
1172:CSRSS
979:links
954:exFAT
783:Shell
748:Store
738:Start
728:Skype
683:Paint
658:Money
586:Clock
533:WinRE
441:Netsh
379:tools
368:Games
149:rsync
87:JSTOR
73:books
2059:List
1940:HPFS
1704:Chat
1662:Apps
1564:Surf
1513:.NET
1481:DCOM
1309:WHEA
1304:USER
1294:SMSS
1084:WSUS
1064:MSMQ
1006:ReFS
969:NTFS
944:CDFS
901:CLFS
896:BITS
796:Aero
773:Xbox
753:Tips
641:2022
626:Maps
621:Mail
596:Edge
548:Apps
343:APIs
269:2019
243:2019
59:news
1839:Pay
1739:Fax
1486:OLE
1461:COM
1444:WSH
1431:API
1192:DLL
1187:EXE
1099:PWS
1079:IIS
1039:DNS
1011:UDF
999:EFS
994:TxF
964:FAT
959:IFS
949:DFS
538:WMI
156:DLL
123:RDC
42:by
2076::
356:NT
351:9x
259:.
234:.
324:e
317:t
310:v
271:.
245:.
121:(
109:)
103:(
98:)
94:(
84:·
77:·
70:·
63:·
36:.
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