EWF disk overlay with DiskOnChip?

  • Thread starter Thread starter Michael Larkin
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Michael Larkin

Hello,

Does anyone know if its possible to have an EWF disk
overlay using a DiskOnChip2000? The EWF documentation
specifically indicates that flash disks may not be used for
a disk overlay since (I think) its not possible to have an
unpartitioned area on the disk. The M-sys dformat software
allows various partitions, including binary partitions, but
I don't see how to have unpartitioned space on the disk.
It that in fact what is necessary?

Thanks,
Michael Larkin
 
Hi Michael,
Does anyone know if its possible to have an EWF disk
overlay using a DiskOnChip2000? The EWF documentation
specifically indicates that flash disks may not be used for
a disk overlay since (I think) its not possible to have an
unpartitioned area on the disk. The M-sys dformat software
allows various partitions, including binary partitions, but
I don't see how to have unpartitioned space on the disk.
It that in fact what is necessary?
Click to expand...

I'm talking about EFW based on RAM overlay.

If I understood documentations correctly.
Second partition is neded only during installation (FBA). Or if you want to
disable EWF.
If you install XPE on HDD, and then copy files on DOM, it should work. But
you can't disable it because EWF needs info from second partition during the
boot to know if it should be enabled or disabled.

I have not tried this yet on flash device, so this is only theory. I'm using
RAM EWF on HDD.

Best regards,
Slobodan
 
Hi Slobodan,

I am trying to find out about EWF with a disk overlay, not
RAM overlay, using DOC. Do you (or does anyone) know that
this is possible or impossible?

Thanks,
Michael
 
Does anyone know if its possible to have an EWF disk
overlay using a DiskOnChip2000?
Click to expand...

Don't know.
The EWF documentation
specifically indicates that flash disks may not be used for
a disk overlay since (I think) its not possible to have an
unpartitioned area on the disk.
Click to expand...

If your disk is marked as fixed then you can have unpartitioned space, same
as on real HDD.
The M-sys dformat software
allows various partitions, including binary partitions, but
I don't see how to have unpartitioned space on the disk.
It that in fact what is necessary?
Click to expand...

I'm using Disk Management and DiskPart, they are standard part of OS.
Using Disk Management you should be able to partition disk as you like.


Best regards,
Slobodan
 
Are you saying that you want the disk overlay to be on the
DOC, or on a separate drive? Having a disk overlay on your
DOC is probably going to wear your device out very quickly.
 
Hi Heidi,

It was my intent to try to use a disk overlay on the DOC,
not on a separate drive, if that is possible. I have the
need for a small amount of state information (maybe 5K) to
be maintained between reboots, but the system is in an
environment where a user will basically pull the plug to
shut it off. My code would very rarely write to the disk.
Is it generally understood that OS disk writes are
significant enough to quickly destroy any flash device?

I can put a real hard drive into my system, but my
impression has been that a flash disk would be more robust
than a hard drive. Perhaps with OS writes to the device
that is no longer true?

Michael
 
Hi Michael,

Consider making another not protected partition, and use it to store
information's. That way you can protect windows using RAM based overlay, and
you could save data you need in unprotected partition.

Hope this helps,

Slobodan
 
Slobodan, I think your suggestion both solves my problem
and greatly adds to the robustness of the system. That
makes perfect sense. Thanks. I'll start trying to
implement that.

Michael
 
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