A question about EWF volume

  • Thread starter Thread starter Ittgx
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Ittgx

Once we used EWF, we believed that the EWF volume should
be greater than the protected volume.
If I use a media like CF,for example,256MB,should I use a
RAM which is 256 at least?
 
Ittgx said:
Once we used EWF, we believed that the EWF volume should
be greater than the protected volume.
If I use a media like CF,for example,256MB,should I use a
RAM which is 256 at least?
Click to expand...
It's certainly a good idea to use a good whack of RAM if you're using the
RAM overlay, but as I understand it, the overlay isn't a straight copy of
the filesystem, it's more a sort of changelog. I'm probably wrong, though.
:)
 
I am sure you're correct here. The EWF volume only stores files that have
changed -- it is not a copy of the underlying disk partition. They could
even save space by only storing the portions of a particular file that
changes, but I'm not sure how far they took it. In any case, the EWF
partition generally only needs to be a fraction of the protected partition's
size since your EXEs, DLLs, and many other types of files should never
change.

Doug G
 
Why wrong? You are right.

For well configured XPe systems. RAM EWF should not consume more than a few
MB or RAM.

Regards,
Slobodan
 
Doug,
The EWF volume only stores files that have changed.
Click to expand...

It could not be further from the truth. EWF have no idea about files and
file system.
It protect any partition regardless of files system that is used.

Partition is broken in clumps (MS calls it that way, 512 Bytes default size)
and changes to clump are what counts.

Regards,
Slobodan
 
I believe that EWF takes a information of the whole
protected volume but it is always focusing on the changed
data.Who can tell me the contents of the first EWF volume?
Of course,however,I think you needn't to lay a greater EWF
volume.It is not necessary,but it is advised,
although the least 8MB space is the deadline of FBA when
it configues EWF.
 
I don't think that I understand most of your comment/question.
It is not necessary,but it is advised,
although the least 8MB space is the deadline of FBA when
it configues EWF.
Click to expand...

You don't need to have any EWF partition not even during the FBA. (RAM EWF
can be configured without creation of this partition)

Regards,
Slobodan
 
Maybe you are right,but Microsoft said so:
At least 8 MB of raw, unallocated space must be available
on the hard disk. This space is used to configure the EWF
during the First Boot Agent (FBA) phase and is deleted
before deploying the run-time image.
This space is required even if you are creating an EWF RAM
overlay.
I am puzzled.
I am forward to getting the answer of the two questions:
What is the contents of the first EWF volume?
What is the standard of the EWF volume's capability?
Where can I get the latest book on this subject in China?
Thank you!
 
Microsoft said:
A RAM overlay requires additional memory that equals the
size of the volume that is to be protected by EWF.
 
If you need doc and component on how to configure RAM EWF without temporary
EWF partition, then go to:
www.xpefiles.com
And in category Components->Other find file ramewf.zip

What is the contents of the first EWF volume?
Click to expand...
This is question for MS, but it is irrelevant.
What is the standard of the EWF volume's capability?
Click to expand...
I don't understand this question.

Regards,
Slobodan
 
This would be the worst case when every clump is changed.

Only possible scenario for this world be total rearrangement of every file.

Regards,
Slobodan
 
Thank you,Slobodan!
And please excuse me, I am Chinese,my English is not very
good.
thank you for your help.
Would you like to communicate with me with the Email
address and are you utilizing any messager tool like MSN
messager?
Yours,
Ittgx
 
My English is also far from good :(

You can use my e-mail address for messenger.
But if your questions are related to this news group, then ask them here so
other people can benefit from answers. Also you might get some answers from
other people as well, on topics that I don't know or use.

Regards,
Slobodan
 
The EWF Volume takes only a few kilobytes (32KB). The 8MB requirement is
made becasue the smallest possible partition that can be created by XP is
8MB. Disk overlays use the EWF Volume for storage, and you can control the
size of the full disk overlay. The 32K space holds the EWF configuration
information. The EWF API (found in QFE Q818822 May 9, 2003) can be used to
access the EWF volume to take control of the EWF driver.

Regards,

Sean Liming
 
It is a good idea to trun off the auto-defrag....

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\OptimalLayout\E
nableAutoLayout (REG_DWORD) = 1

Regards,

Sean Liming
 
Did you meant to say = 0?

Regards,
Slobodan

Sean Liming (eMVP) said:
It is a good idea to trun off the auto-defrag....

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\OptimalLayout\E
nableAutoLayout (REG_DWORD) = 1

Regards,

Sean Liming
Click to expand...
 
I like this answer.Thank you,Sean Liming!
-----Original Message-----
The EWF Volume takes only a few kilobytes (32KB). The 8MB requirement is
made becasue the smallest possible partition that can be created by XP is
8MB. Disk overlays use the EWF Volume for storage, and you can control the
size of the full disk overlay. The 32K space holds the EWF configuration
information. The EWF API (found in QFE Q818822 May 9, 2003) can be used to
access the EWF volume to take control of the EWF driver.

Regards,

Sean Liming





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Click to expand...
 
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