Re: EWF File Persistence Corruption

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: KM (konstmor_at_nospam_yahoo.com)
Date: 01/13/05 

Date: Wed, 12 Jan 2005 16:00:24 -0800

Tim,

In any case you may want to disable the write cache option on disk. Then no more than one sector can be lost by power down during
write operation. 

-- 
 Regards,
        KM, BSquare Corp.
> Km,
>
> I'm writing to an unprotected NTFS as you probably expected. I agree with
> you completely. There is only so much you can do in software with the
> provided hardware.
> Thanks for you response
>
> tim
>
> "KM" wrote:
>
> > Tim,
> >
> > You did not answer the first question. Are you writing the file to an unprotected partition?
> > Or you writing it to protected one and then trying to commit the changes?
> >
> > If the problem happens during the write operation to the disk.. Well, you have a conceptual problem rather the a software issue.
You
> > want to dump some ram content (some variable blocks in memory) to a persistent storage. Unless you have very fast persistent
storage
> > or hardware protection against a power loss, you may not fix the problem completely.
> >
> > -- 
> >  Regards,
> >         KM, BSquare Corp.
> >
> > PS. You anyway better use more reliable FS. Hope you went with NTFS on unprotected partition.
> >
> >
> > > KM,
> > >
> > > Went to XPE and EWF RAM to remove UPS and XP Pro.
> > >
> > > The ini file is only 4K and the problem doesnt happen often. But, it does
> > > happen occasionally and the customer could potentially lose information when
> > > corruption occurs - such as how many x-ray scans a system has taken.
> > >
> > > Might have to use separate mechanical counters for critical info.
> > >
> > > Thanks.
> > >
> > > "KM" wrote:
> > >
> > > > Tim,
> > > >
> > > > You are writing the file to unprotected partition? Usually ini files are small. Does it take a long time for your apps to
write
> > the
> > > > file?
> > > >
> > > > Anyway... probably only hardware options can give you a high assurance that the file writes would be finished. UPS?
> > > >
> > > > -- 
> > > >  Regards,
> > > >         KM, BSquare Corp.
> > > >
> > > >
> > > > > I'm using EWF RAM and an additional read/write volume for ini file
> > > > > persistence. The problem is, once in a while the system could be powered off
> > > > > during a write and corrupt the file. Has anyone encountered this? I need some
> > > > > parameters to be persistent.
> > > > > -- 
> > > > > Tim
> > > >
> > > >
> > > >
> >
> >
> >

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