Defragmented file prefixed $

[Guest]

I have just defragmented my hard drive (I use O&O defrag) and there is a
badly defragmented but locked file C:\$extend\$UsnJrnl:$J$DATA. What is the
significance of this file and the $ prefix? Can I delete it? Thanks.

 

[Wesley Vogel]

What is the significance of this file and the $ prefix?

Files with a dollar sign prefix ($) are usually hidden from the Windows API
(Application Programming Interface). Like the Master File Table ($mft).

Can I delete it?

I would not. Maybe someone that knows more than I do will advise
differently.

[[NTFS includes several system files, all of which are hidden from view on
the NTFS volume. A system file is one used by the file system to store its
metadata and to implement the file system. System files are placed on the
volume by the Format utility.

$Extend is an NTFS system file. Used for various optional extensions such
as quotas, reparse point data and object identifiers.]]
from...
NTFS System Files
http://www.ntfs.com/ntfs-system-files.htm

[[Not all NTFS volumes contain a $UsnJrnl file. A $UsnJrnl file is created
on a volume only when a program that uses the file makes the first write
request.]]
from..
Error messages when you try to gain access to an NTFS volume
http://support.microsoft.com/kb/311724

$UsnJrnl
[[Update sequence number (USN) change journal, which provides a persistent
log of all changes made to files on the volume. As files, directories, and
other NTFS objects are added, deleted, and modified, NTFS enters records
into the USN change journal, one for each volume on the computer. Each
record indicates the type of change and the object changed.

Programs can consult the USN change journal to determine all the
modifications made to a set of files. The USN change journal is much more
efficient than checking time stamps or registering for file notifications.
The USN change journal is enabled and used by the Indexing Service, File
Replication Service (FRS), Remote Installation Service (RIS), and Remote
Storage.]]
from...
ntcmds.chm::/fsutil_usn.htm

What is $Usnjrnl?
[[The Windows 2000 Change Journal is a database that contains a list of
every change made to the files or directories on an NTFS 5.0 volume. Each
volume has its own Change Journal database that contains records reflecting
the changes occurring to that volume's files and directories.]]
Keeping an Eye on Your NTFS Drives: the Windows 2000 Change Journal
Explained
http://www.microsoft.com/msj/0999/journal/journal.aspx

SWAG: You have the Indexing Service running or had it running and it created
C:\$extend\$UsnJrnl:$J$DATA.

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

 

[Rock]

I have just defragmented my hard drive (I use O&O defrag) and there is a
badly defragmented but locked file C:\$extend\$UsnJrnl:$J$DATA. What is
the
significance of this file and the $ prefix? Can I delete it? Thanks.

Why would you want to? It almost certainly isn't causing any problems.
It's a system file. Don't mess with them. If you are that obsessed with
defragmenting this file try Raxco's Perfect Disk. It can defrag locked
system files and meta data during an offline defrag, but I wouldn't worry
about it.

 

[Guest]

Why would you want to? It almost certainly isn't causing any problems.
It's a system file. Don't mess with them. If you are that obsessed with
defragmenting this file try Raxco's Perfect Disk. It can defrag locked
system files and meta data during an offline defrag, but I wouldn't worry
about it.

 

[Guest]

What is the significance of this file and the $ prefix?

Files with a dollar sign prefix ($) are usually hidden from the Windows API
(Application Programming Interface). Like the Master File Table ($mft).

Can I delete it?

I would not. Maybe someone that knows more than I do will advise
differently.

[[NTFS includes several system files, all of which are hidden from view on
the NTFS volume. A system file is one used by the file system to store its
metadata and to implement the file system. System files are placed on the
volume by the Format utility.

$Extend is an NTFS system file. Used for various optional extensions such
as quotas, reparse point data and object identifiers.]]
from...
NTFS System Files
http://www.ntfs.com/ntfs-system-files.htm

[[Not all NTFS volumes contain a $UsnJrnl file. A $UsnJrnl file is created
on a volume only when a program that uses the file makes the first write
request.]]
from..
Error messages when you try to gain access to an NTFS volume
http://support.microsoft.com/kb/311724

$UsnJrnl
[[Update sequence number (USN) change journal, which provides a persistent
log of all changes made to files on the volume. As files, directories, and
other NTFS objects are added, deleted, and modified, NTFS enters records
into the USN change journal, one for each volume on the computer. Each
record indicates the type of change and the object changed.

Programs can consult the USN change journal to determine all the
modifications made to a set of files. The USN change journal is much more
efficient than checking time stamps or registering for file notifications.
The USN change journal is enabled and used by the Indexing Service, File
Replication Service (FRS), Remote Installation Service (RIS), and Remote
Storage.]]
from...
ntcmds.chm::/fsutil_usn.htm

What is $Usnjrnl?
[[The Windows 2000 Change Journal is a database that contains a list of
every change made to the files or directories on an NTFS 5.0 volume. Each
volume has its own Change Journal database that contains records reflecting
the changes occurring to that volume's files and directories.]]
Keeping an Eye on Your NTFS Drives: the Windows 2000 Change Journal
Explained
http://www.microsoft.com/msj/0999/journal/journal.aspx

SWAG: You have the Indexing Service running or had it running and it created
C:\$extend\$UsnJrnl:$J$DATA.

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

I have just defragmented my hard drive (I use O&O defrag) and there is a
badly defragmented but locked file C:\$extend\$UsnJrnl:$J$DATA. What is
the significance of this file and the $ prefix? Can I delete it? Thanks.

Thanks for the reply, it helped a lot.

 

[Wesley Vogel]

You're welcome.

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

What is the significance of this file and the $ prefix?

Files with a dollar sign prefix ($) are usually hidden from the Windows
API (Application Programming Interface). Like the Master File Table
($mft).

Can I delete it?

I would not. Maybe someone that knows more than I do will advise
differently.

[[NTFS includes several system files, all of which are hidden from view
on the NTFS volume. A system file is one used by the file system to
store its metadata and to implement the file system. System files are
placed on the volume by the Format utility.

$Extend is an NTFS system file. Used for various optional extensions
such as quotas, reparse point data and object identifiers.]]
from...
NTFS System Files
http://www.ntfs.com/ntfs-system-files.htm

[[Not all NTFS volumes contain a $UsnJrnl file. A $UsnJrnl file is
created on a volume only when a program that uses the file makes the
first write request.]]
from..
Error messages when you try to gain access to an NTFS volume
http://support.microsoft.com/kb/311724

$UsnJrnl
[[Update sequence number (USN) change journal, which provides a
persistent log of all changes made to files on the volume. As files,
directories, and other NTFS objects are added, deleted, and modified,
NTFS enters records into the USN change journal, one for each volume on
the computer. Each record indicates the type of change and the object
changed.

Programs can consult the USN change journal to determine all the
modifications made to a set of files. The USN change journal is much more
efficient than checking time stamps or registering for file
notifications. The USN change journal is enabled and used by the
Indexing Service, File Replication Service (FRS), Remote Installation
Service (RIS), and Remote Storage.]]
from...
ntcmds.chm::/fsutil_usn.htm

What is $Usnjrnl?
[[The Windows 2000 Change Journal is a database that contains a list of
every change made to the files or directories on an NTFS 5.0 volume. Each
volume has its own Change Journal database that contains records
reflecting the changes occurring to that volume's files and
directories.]]
Keeping an Eye on Your NTFS Drives: the Windows 2000 Change Journal
Explained
http://www.microsoft.com/msj/0999/journal/journal.aspx

SWAG: You have the Indexing Service running or had it running and it
created C:\$extend\$UsnJrnl:$J$DATA.

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

I have just defragmented my hard drive (I use O&O defrag) and there is a
badly defragmented but locked file C:\$extend\$UsnJrnl:$J$DATA. What is
the significance of this file and the $ prefix? Can I delete it? Thanks.

Thanks for the reply, it helped a lot.

 

[Dave Marden]

Just for anyone else looking for this problem. The Jrnl file is actually
contiguous, it actually is set to use a certain amount of space and if it
isn't using that much space it simply appears to have gaps in between the
parts where information is. Defragging sees these gaps as representation of
a fragment where-as it is actually [Excess Allocation] . This simply states
that the files is allocated more space than it is currently using.

Dave Marden