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Author Topic: Delete of C:\$Extend\$UsnJrnl:$J:$DATA  (Read 27286 times)
greyowl
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« on: December 08, 2008, 09:05:07 pm »

Below is a FAQ item from the website:

How do I defragment "C:\$Extend\$UsnJrnl:$J:$DATA"?
    This huge file is used by Windows to track changes in other files and cannot be defragmented. You can delete it by entering the following on the Run commandline (Windows 2003/XP/Vista, not Windows 2000), it can take several minutes to finish:
    fsutil usn deletejournal /n c:

I am wondering if it is safe to proceed with this?  What effect does it have on the system to delete it?  I read the MS section referred but this really did not clarify this for me.  I don't use the indexing service in XP so that doesn't matter.  I don't know what the File Replication service (FRS) which is effected does. 
If deleted, does Windows create a new file and start building it?

Please explain and clarify.  Thanks
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greyowl
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« Reply #1 on: December 08, 2008, 10:10:46 pm »

PS--I have search my system and cannot find this file.  I do not recall ever having deleted it in the past.
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jeroen
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« Reply #2 on: December 08, 2008, 10:35:04 pm »

I am wondering if it is safe to proceed with this?
Yes. It is basically a cache, used by some Windows services. If the cache is not there then the services will be a bit slower, that's all.

Quote
If deleted, does Windows create a new file and start building it?
Yes.

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I have search my system and cannot find this file.
It's a special system file and can only be seen with special tools. It only exists on NTFS disks, not on FAT disks.
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greyowl
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« Reply #3 on: December 09, 2008, 01:34:41 am »

Thank you for the explanation which is quite helpful.
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greyowl
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« Reply #4 on: December 09, 2008, 03:27:27 am »

I tried to delete this file according to your instructions in the FAQ section but it did not work.   At the Command Prompt, I typed   fsutil usn deletejournal /n c:
I got the error:  The volume change journal is not active.
What does this mean?
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jeroen
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« Reply #5 on: December 09, 2008, 06:44:42 pm »

The volume change journal is not active.
What does this mean?
I think it means that the file is not there. Have you actually seen this file mentioned in your "jkdefrag.log" file? Is your disk NTFS or FAT?
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greyowl
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« Reply #6 on: December 10, 2008, 03:13:27 am »

The file was not mentioned in the most recent JkDefrag log.  My disk is NTFS. 
I have the index service disabled.  Which other services are used by this file?  Could it be that my services are disabled therefore Windows does not create the file?
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greyowl
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« Reply #7 on: December 10, 2008, 03:23:02 am »

PS--On the MS link, it mentions using fsutil to create a journal.  This file is used by the File Replication Service(FRS) according to MS.  I check my list of services and the FRS doesn't exist.

I am confused by this.

Should I have this file in my computer?
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jeroen
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« Reply #8 on: December 10, 2008, 06:53:27 am »

I have the index service disabled.  Which other services are used by this file?  Could it be that my services are disabled therefore Windows does not create the file?
I'm sorry but I don't know exactly which Microsoft programs are using this file, and I don't know why it does not exist on your computer. All I know is that if it's there that you can safely turn it off and save a lot of disk space.
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greyowl
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« Reply #9 on: December 10, 2008, 05:23:51 pm »

Thanks for the information.
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poutnik
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« Reply #10 on: December 11, 2008, 01:05:38 pm »

In fact the file is not so huge, being a sparse file.

Look at Jkdefrag log file, how many clusters it occupies.
If you will multiply the number by cluster size, result is much lower than claimed filesize.

AFAIK the file serves as something as disk changelog at application level.
( in opposite to logfile in root being NTFS journal log at filesystem level ).

Applications can then ask OS about changes since given time
they are interested in.

I can always be wrong, Jeroen may correct me :-)

Edit: Well, I am not sure about sparses, if all their size is claimed occupied or not.
« Last Edit: December 11, 2008, 01:07:34 pm by poutnik » Logged

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greyowl
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« Reply #11 on: December 11, 2008, 02:41:39 pm »

Poutnik,

Thanks for the explanation.

Do you think it is ok that my system does not appear to have this file?

Thanks
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poutnik
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« Reply #12 on: December 11, 2008, 02:44:19 pm »

I think yes.
IIRC I have read somewhere it is not created until OS is asked
by an app, able to use it, to create and manage it, and offer its service to app.
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It can be fast, good or easy. You can pick just 2 of them....
Treating Spacehog zone by the same effort as Boot zone is like cleaning a garden by the same effort as a living room.
greyowl
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« Reply #13 on: December 11, 2008, 02:48:00 pm »

Oh, thanks --this is a relief.
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