Compact Flash with EWF

[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.

 

[Sean Liming \(MVP\)]

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.

 

[Richard]

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?

 

[mikelcdfels]

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.

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

 

[mikelcdfels]

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?

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

 

[Sean Liming \(MVP\)]

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.

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

 

[mikelcdfels]

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

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.