Re: Newbie EWF question
- From: "Sean Liming \(eMVP\)" <sean_liming@xxxxxxxxxxxx>
- Date: Tue, 6 Jun 2006 02:11:06 -0700
Data can get corrupted to the unprotected drive as data is being written.
There is a CF manufacture SiliconSystems that is offering a CF card with
some power protection.
Regards,
Sean Liming
www.sjjmicro.com / www.seanliming.com
XP Embedded Book Author - XP Embedded Advanced, XP Embedded Supplemental
Toolkit.
"Matt Samet" <MattSamet@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:0E2B85EA-5232-4643-ADCC-DBF521FC8388@xxxxxxxxxxxxxxxx
Thanks for this info...
It sounds like this is doable (complexities with managing drives with HORM
and EWF aside)...
Do you have any more info on what happens if power is removed from the
device? Can data be corrupted with an EWF configuration? With CF / IDE
disks
configuration?
Thanks...
-Matt
"Sean Liming (eMVP)" wrote:
What you are asking for can be done conceptually. The News Group has had
several requests for this setup. You control what partitions EWF
protects.
CF is not faster than an IDE disk. Most CF cards don't have DMA for
faster
data access, most are Port I/O mode - very slow for XPe boot. Using HORM
will speed the boot procees so you shouldn't see too much of an impact
from
a CF bandwidth.
How will data be stored on the IDE hard drive? Are you going to use a
database? Regardless of the power issue, implementing HORM with storage
media can be a bit tricky to architect. There is an article that
describes
how to handle data drives wtih HORM:
Dismounting Volumes in a Hibernate Once/Resume Many Configuration
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnxpesp2/html/HORMDismountingVolumesInHibernateOnceResumeManyConfiguration.asp
Regards,
Sean Liming
www.sjjmicro.com / www.seanliming.com
XP Embedded Book Author - XP Embedded Advanced, XP Embedded Supplemental
Toolkit.
"Matt Samet" <Matt Samet@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:CF5AF4E4-933E-4CB3-BE1B-845818419B61@xxxxxxxxxxxxxxxx
Hi,
Can someone tell me if the following is possible?
I'd like to have a totally read-only bootable XPE partition for my
device.
I'm thinking of using HORM (hibernate once read many) and EWF -- the
goal
is
to have a configuration where the device boots up ALL the time exactly
the
same. I'm considering having this completely read-only (system)
partition
on
a compactflash card. Since it's solid state, it would boot up much
more
quickly than IDE.
I also have a need to have a read-write partition on a mass-storage IDE
disk
(for saving user data). This disk/partition would be completely
separate
from the system partition, it's basically an empty partition for
storing
files. It's my guess that EWF *would* protect the compactflash
partition
but
would *not* protect the storage partition (which also is on a
completely
separate hardware disk - IDE HDD).
Now, given all of that, is it possible to have that configuration and
ALSO
have the capability to remove the power at any time to turn the device
off
(no shutdown - plug can be pulled at any time)? I would guess that
this
is
no problem for the CompactFlash system partition but could be a problem
with
the user data IDE disk. I could make it a requirement that whenever a
file
is
written to the IDE disk, a program can be run to unmount it or
whatever...
just wondering mainly what is the ramifications of "pulling the plug"
where
IDE disks are present? (or any other ramifications)?
Thanks,
-Matt
.
- References:
- Re: Newbie EWF question
- From: Sean Liming \(eMVP\)
- Re: Newbie EWF question
- From: Matt Samet
- Re: Newbie EWF question
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