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Author Topic: c:\$Extend\$UsnJrnl:$J:$DATA  (Read 32512 times)
nsalta
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« on: August 29, 2007, 10:40:59 pm »

Since the version 3.17 I've notice a new metafile in the log: c:\$Extend\$UsnJrnl:$J:$DATA

The problem is that it size that keeps rising and rising every time I run the defrager. (at this moment the file size is nearly 1.5 GB)

Anyone knows what c:\$Extend\$UsnJrnl:$J:$DATA is? And is it normal the size to rise?
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Myriades
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« Reply #1 on: August 29, 2007, 11:12:19 pm »

Hi, i can't explain u that but u can take a look this place
http://book.itzero.com/read/microsoft/0507/microsoft.press.microsoft.windows.internals.fourth.edition.dec.2004.internal.fixed.ebook-ddu_html/0735619174/ch12lev1sec6.html
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cf
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« Reply #2 on: August 30, 2007, 01:07:30 pm »

EDIT: This file is not the real NTFS journal (that is C:\$LogFile). It is just a log file for changes on the harddisk which can be enabled by applications, but I don't know for what particular purpose.

According to the link that Myriades posted it is a sparse file. That means, it is not fully allocated on disk, but only the really needed parts (the rest is just "empty space" inside the file).

So you have to take a look at the cluster allocation in the logfile:
Code:
11:55:24   Fragments       Bytes  Clusters Name
11:55:24           1  5312824144      2256 C:\$Extend\$UsnJrnl:$J:$DATA


In my case (with 4KB/Cluster), you get a real size of 2256*4KB=8.8MB.
Not really something to worry about, I think.

Btw. @jeroen: Your MFT scanner works perfectly on all computers I have tested, and it's about 3 times faster than the old scanner code Cool .
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jeroen
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« Reply #3 on: August 30, 2007, 05:46:33 pm »

Quote from: "cf"
Btw. @jeroen: Your MFT scanner works perfectly on all computers I have tested, and it's about 3 times faster than the old scanner code Cool .

Thanks for the feedback and the compliment, I appreciate it!
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nsalta
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« Reply #4 on: August 30, 2007, 07:44:56 pm »

Thanks for the info. Mine is occupying only 30 MB of real space so nothing to worry about!
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boco
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« Reply #5 on: September 02, 2007, 03:24:08 am »

This file is the USN Journal. It keeps track of changes on the NTFS disk and improves reliability a lot.

The file grows so fast because JKDefrag does make a lot of changes on the disk! It should shrink again after a graceful shutdown and reboot.

Please note that on XP, the USN Journal is not always enabled, on Vista, it is.
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Leolo
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« Reply #6 on: September 09, 2007, 06:58:45 pm »

Hi everyone,

Here's a interesting article at Microsoft's site that explains how to to delete and recreate that file in case of problems (like, for example corrupted sectors):

http://support.microsoft.com/kb/311724

The command in question is this one:
fsutil usn deletejournal /D driveletter

Regards.
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ektorbarajas
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« Reply #7 on: October 22, 2007, 04:41:01 am »

I've noticed that as time passes, the fragments of the:

C:\$Extend\$UsnJrnl:$J:$DATA
and
D:\$Extend\$UsnJrnl:$J:$DATA

files keeps on growing, below and example of those two files:

15:08:45 These items could not be moved:
15:08:45   Fragments       Bytes  Clusters Name
15:08:45          39    70263568      8976 C:\$Extend\$UsnJrnl:$J:$DATA
15:11:56          53   125460960      9216 D:\$Extend\$UsnJrnl:$J:$DATA

(I've just copy&paste the lines where those files appears).

Also I've found that pagedefrag neither defragment those files.

So I was wondering if jkdefrag in a future will be able to defrag such files?

or does somebody knows of a free util that can defrag those files?
Raxco's PerfectDisk 8 defrag thos files at boot time, but I'm not going to use that software just to defrag those files.
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jeroen
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« Reply #8 on: October 22, 2007, 02:04:22 pm »

Quote from: "ektorbarajas"
So I was wondering if jkdefrag in a future will be able to defrag such files?

JkDefrag is build on top of the Windows defragmentation API and can only defrag and move files that the API allows it to. Perhaps in the future I will make a version that can run at boot time, but there are many other things I want to do first. I think JkDefrag can defrag the journal if you boot from cdrom, for example with Bart PE, but I haven't tried that myself.
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Itchy
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« Reply #9 on: October 22, 2007, 02:51:26 pm »

Quote from: "jeroen"
Quote from: "ektorbarajas"
So I was wondering if jkdefrag in a future will be able to defrag such files?

JkDefrag is build on top of the Windows defragmentation API and can only defrag and move files that the API allows it to. Perhaps in the future I will make a version that can run at boot time, but there are many other things I want to do first. I think JkDefrag can defrag the journal if you boot from cdrom, for example with Bart PE, but I haven't tried that myself.
I've defragged my laptop using JkDefrag from a BartPE disc and can say that the C:\$Extend\$UsnJrnl:$J:$DATA still isn't defragged.
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jeroen
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« Reply #10 on: October 22, 2007, 06:02:21 pm »

Quote from: "Itchy"
I've defragged my laptop using JkDefrag from a BartPE disc and can say that the C:\$Extend\$UsnJrnl:$J:$DATA still isn't defragged.

Ok, thanks for the feedback. Which Windows version?
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Itchy
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« Reply #11 on: October 23, 2007, 10:03:23 pm »

Quote from: "jeroen"
Quote from: "Itchy"
I've defragged my laptop using JkDefrag from a BartPE disc and can say that the C:\$Extend\$UsnJrnl:$J:$DATA still isn't defragged.

Ok, thanks for the feedback. Which Windows version?
Windows XP Home Edition SP2.
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jeroen
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« Reply #12 on: October 23, 2007, 11:47:55 pm »

Quote from: "Itchy"
Windows XP Home Edition SP2.

Ok, thanks.
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ektorbarajas
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« Reply #13 on: October 24, 2007, 05:28:38 am »

Quote
or does somebody knows of a free util that can defrag those files?


Hi there, just to ask if someone knows something about that.

btw I just want to congratulate again (and again) Jeroen for such a great software!

That's the way the software must be developed:
1) very very functional
2) not bloated
3) resource friendly.
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jimbo
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« Reply #14 on: October 26, 2007, 09:19:23 am »

Just to clarify a point.... The USN journal is not about stability / reliability / or any other such. It is about tracking changes to files so that applications can monitor for anything that has been updated.

This means that, for example, the indexing service can only re-index files that have changed, or shadow copy can monitor changes, or, bizarrely, and most commonly, Windows Live Messenger (MSN messengers current incarnation) can use it for its shared folders implementation.

On a desktop PC, it is generally safe to delete this journal using the fsutil command

e.g.
fsutil usn deletejournal /d c:

and as soon as any application requests data from the journal it will be automatically recreated.
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