Compact Flash with EWF

  • Thread starter Thread starter mikelcdfels
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mikelcdfels

Hi everyone,

This is the first time i write to this newgroup, i ´ve read it for a
long time and it help me to solve a lot of problems.

Mi doubt is to implement EWF on CompactFlash i´ve read on Sean Liming
´s book that EWF with a RAM overlay is useful to prevent malfunctions
and enlarge the life of a CompactFlash.

If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?

Hope you understand my questions.

Thanks in advance.
 
If your application need to write data from time to time, then you might
want to consider using File Based Write Filter (FBWF).
http://www.seanliming.com/Docs/FBWF.pdf

--
Regards,

Sean Liming
www.sjjmicro.com / www.seanliming.com
Book Author - XP Embedded Advanced, XP Embedded Supplemental Toolkit
Hi everyone,

This is the first time i write to this newgroup, i ´ve read it for a
long time and it help me to solve a lot of problems.

Mi doubt is to implement EWF on CompactFlash i´ve read on Sean Liming
´s book that EWF with a RAM overlay is useful to prevent malfunctions
and enlarge the life of a CompactFlash.

If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?

Hope you understand my questions.

Thanks in advance.
 
Sean gave you one method, however I write to config files all the time.
Some are on a USB Drive not protected by EWF and other critical files are on
CF protected by EWF. I have it commit everytime during a normal shutdown or
reboot.

In case of a power failure or something, the system comes up with last known
good values. This works fine for my needs however may not be suitable for
your needs.

Richard


If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?
 
If your application need to write data from time to time, then you might
want to consider using File Based Write Filter (FBWF).http://www.seanliming.com/Docs/FBWF.pdf

--
Regards,

Sean Limingwww.sjjmicro.com/www.seanliming.com

Hi everyone,

This is the first time i write to this newgroup, i ´ve read it for a
long time and it help me to solve a lot of problems.

Mi doubt is to implement EWF on CompactFlash i´ve read on Sean Liming
´s book that EWF with a RAM overlay is useful to prevent malfunctions
and enlarge the life of a CompactFlash.

If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?

Hope you understand my questions.

Thanks in advance.
Click to expand...



Thanks Sean for you quick response,

I didn´t know the existence of FBWF it looks more powerful and
flexible and EWF and it´s more suitable to my needs.

I will try this FBWF tonight and create a NTFS partition with the
whole size of my CF because i´ve read on your PDF that FBWF doesn´t
need any extra partition.

Regards,

Mikel Angulo Cubas.
Castelldefels, Barcelona (Spain).

http://www.iesinformatica.es
 
Sean gave you one method, however I write to config files all the time.
Some are on a USB Drive not protected by EWF and other critical files areon
CF protected by EWF. I have it commit everytime during a normal shutdownor
reboot.

In case of a power failure or something, the system comes up with last known
good values. This works fine for my needs however may not be suitable for
your needs.

Richard


If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?
Click to expand...

Hi Richard, thanks for your response,

I will try FBWF instead EWF it seems the more correct solution to my
needs.

Anyway i don´t have the possibility to have an extra drive, all must
be inside the CF, i ´ve read in this forum that i can create an extra
partition for those file who needs to be written without EWF´S
protection. This is the solution that i would try if finally try the
EWF filter.

Regards,

Mikel Angulo Cubas.
Castelldefels, Barcelona (Spain).

http://www.iesinformatica.es
 
FBWF is new and came out in Feature Pack 2007.

--
Regards,

Sean Liming
www.sjjmicro.com / www.seanliming.com
Book Author - XP Embedded Advanced, XP Embedded Supplemental Toolkit
If your application need to write data from time to time, then you might
want to consider using File Based Write Filter
(FBWF).http://www.seanliming.com/Docs/FBWF.pdf

--
Regards,

Sean Limingwww.sjjmicro.com/www.seanliming.com
Book Author - XP Embedded Advanced, XP Embedded Supplemental

Hi everyone,

This is the first time i write to this newgroup, i ´ve read it for a
long time and it help me to solve a lot of problems.

Mi doubt is to implement EWF on CompactFlash i´ve read on Sean Liming
´s book that EWF with a RAM overlay is useful to prevent malfunctions
and enlarge the life of a CompactFlash.

If i build and image with EWF and RAM overlay, is possible to my
application to write sometimes in a config file or is all the volume
read only with a volatile memory?

Hope you understand my questions.

Thanks in advance.
Click to expand...



Thanks Sean for you quick response,

I didn´t know the existence of FBWF it looks more powerful and
flexible and EWF and it´s more suitable to my needs.

I will try this FBWF tonight and create a NTFS partition with the
whole size of my CF because i´ve read on your PDF that FBWF doesn´t
need any extra partition.

Regards,

Mikel Angulo Cubas.
Castelldefels, Barcelona (Spain).

http://www.iesinformatica.es
 
FBWF is new and came out in Feature Pack 2007.

--
Regards,

Sean Limingwww.sjjmicro.com/www.seanliming.com









Thanks Sean for you quick response,

I didn´t know the existence of FBWF it looks more powerful and
flexible and EWF and it´s more suitable to my needs.

I will try this FBWF tonight and create a NTFS partition with the
whole size of my CF because i´ve read on your PDF that FBWF doesn´t
need any extra partition.

Regards,

Mikel Angulo Cubas.
Castelldefels, Barcelona (Spain).

http://www.iesinformatica.es
Click to expand...

Hi Sean,

Thanks for your PDF, FBWF works fine. Now i will try to make a custom
shell with our software i will follow you book´s instructions.
 
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