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Mystery in the defrag of boot files


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Running the defrag of boot files on my PC, running AVIEN correctly, as screen

435741defrag riuscito.PNG

Instead on another PC running not to be successful, he says that the register entries are missing

707303defrag non riuscito.PNG

I tried to reinstall from scratch S.O. And with the system "clean" gives me the exact same message.

What can it be?


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-b doesn't look like a valid option.

Microsoft Windows [Version 6.1.7600]

Copyright © 2009 Microsoft Corporation. All rights reserved.

C:\Users\Blah>defrag /?

Microsoft Disk Defragmenter

Copyright © 2007 Microsoft Corp.


Locates and consolidates fragmented files on local volumes to

improve system performance.


defrag <volumes> | /C | /E <volumes> [/H] [/M | [/V]]

defrag <volumes> | /C | /E <volumes> /A [/H] [/M | [/V]]

defrag <volumes> | /C | /E <volumes> /X [/H] [/M | [/V]]

defrag <volume> /T [/H] [/V]


Value Description

/A Perform analysis on the specified volumes.

/C Perform the operation on all volumes.

/E Perform the operation on all volumes except those specified.

/H Run the operation at normal priority (default is low).

/M Run the operation on each volume in parallel in the background.

/T Track an operation already in progress on the specified volume.

/U Print the progress of the operation on the screen.

/V Print verbose output containing the fragmentation statistics.

/X Perform free space consolidation on the specified volumes.


defrag C: /U /V

defrag C: D: /M

defrag C:\mountpoint /A /U

defrag /C /H /V

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The option "-b" is not 'documented, but is used by the OS I think every 2 or 3 days. (However it sees fit when the OS ...) to do it

only when the system but is based on data from the Prefetcher, so if by chance the prefetch 'was disabled or if the PC has not yet had a

being at rest ( "On Idle") for enough time, this process is not 'yet ever initiated and the defrag, not finding the registry key that

says when he made the last optimization boot files, which recalls that mistake.

the key is this

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher\\LastDiskLayoutTimeString

However I solved the problem by running this command and restarting

rundll32.exe advapi32.dll,ProcessIdleTasks

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