Hello,

I'm having a weird issue. I have a huge Outlook pst (6GB) file that i
want to compress. I have tried WinRAR, WinZip, 7-Zip, WinAce and all of
them are compressiong succesfully my file. However, when I try to open
the archive I always get a CRC corruption! I get the exact same
behaviour with all the archive tools and different archive format!

Any idea what could be wrong?

Thanks

On Jan 26, 7:23 am, "esieens" <esie...@chez.com> wrote:
> Hello,
>
> I'm having a weird issue. I have a huge Outlook pst (6GB) file that i
> want to compress. I have tried WinRAR, WinZip, 7-Zip, WinAce and all of
> them are compressiong succesfully my file. However, when I try to open
> the archive I always get a CRC corruption! I get the exact same
> behaviour with all the archive tools and different archive format!
>
> Any idea what could be wrong?
>
> Thanks

Just a guess ... but it is probably the size of the file.  I would try
breaking the
6BG up into smaller files first.

- Michael

Thanks Michael - how canI break it into a smaller size?

On Jan 26, 7:51 am, "esieens" <esie...@chez.com> wrote:
> Thanks Michael - how canI break it into a smaller size?

I believe that a lot of these compression apps have a limit of 2GB (max
size of a signed 32 bit integer).
There are probably some out there that support larger sizes and there
might even be some which will
process larger files such as your in smaller peices.  But I'm not
familiar enough with them to offer any
suggestions.

- Michael

"michael" <michael@michael-maniscalco.com> wrote in message 
news:1169814941.388245.88320@v45g2000cwv.googlegroups.com...
>
> Just a guess ... but it is probably the size of the file.  I would try
> breaking the 6BG up into smaller files first.
>
No, I doubt that is the problem. All of these archivers claim to support 
very large archives, much bigger than 6GB, so either they are being dishonet 
about their product capabilities, or there is a problem with the data. The 
fact that all 3 archivers report a CRC problem seems to indicate that the 
latter is the case.

Firstly, I would do a disk scan to see if the disk has any bad sectors or 
not.

Also, at what stage does the error occur, is it when opeing the srchive or 
when extracting?

regards
Mike 

Mike wrote:
)
) "michael" <michael@michael-maniscalco.com> wrote in message 
) news:1169814941.388245.88320@v45g2000cwv.googlegroups.com...
)>
)> Just a guess ... but it is probably the size of the file.  I would try
)> breaking the 6BG up into smaller files first.
)>
) No, I doubt that is the problem. All of these archivers claim to support 
) very large archives, much bigger than 6GB, so either they are being dishonet 
) about their product capabilities, or there is a problem with the data. The 
) fact that all 3 archivers report a CRC problem seems to indicate that the 
) latter is the case.

Do they also claim to be able to compress a *single file* of 6GB ?

) Firstly, I would do a disk scan to see if the disk has any bad sectors or 
) not.

Should also run a RAM check, because compressing 6GB could be a pretty
heavy hit on the RAM chips.


SaSW, Willem
-- 
Disclaimer: I am in no way responsible for any of the statements
            made in the above text. For all I know I might be
            drugged or something..
            No I'm not paranoid. You all think I'm paranoid, don't you !
#EOT

It opens ok but i get the error when i run a test.


> Also, at what stage does the error occur, is it when opeing the srchive or
> when extracting?
>

On Jan 26, 3:31 pm, "esieens" <esie...@chez.com> wrote:
> It opens ok but i get the error when i run a test.

Sounds like you have bad RAM, honestly.  Download memtest86, write it
to a bootable CD or diskette, boot from it, and run a test on your
machine overnight.

On Jan 27, 1:08 am, "Jim Leonard" <MobyGa...@gmail.com> wrote:
> On Jan 26, 3:31 pm, "esieens" <esie...@chez.com> wrote:
>
> > It opens ok but i get the error when i run a test.Sounds like you have bad RAM, honestly.  Download memtest86, write it
> to a bootable CD or diskette, boot from it, and run a test on your
> machine overnight.

run memtest86 - no error reported.

On Jan 27, 12:17 pm, "esieens" <esie...@chez.com> wrote:
> On Jan 27, 1:08 am, "Jim Leonard" <MobyGa...@gmail.com> wrote:
>
> > On Jan 26, 3:31 pm, "esieens" <esie...@chez.com> wrote:
>
> > > It opens ok but i get the error when i run a test.Sounds like you have bad RAM, honestly.  Download memtest86, write it
> > to a bootable CD or diskette, boot from it, and run a test on your
> > machine overnight.run memtest86 - no error reported.

At what percentage (%) the RAR test give a CRC error and what is the 
file size and where do you write the compressed output file? because 
when you backup a 6GB Outlook .pst file with RAR (normal mode) it 
shall become littler then half of the size 2.5-3GB and that is bigger 
then 2GB what can be the limit for some backup storage devices (like 
USB disk) as maximum file size the file system support, in this case 
you can use the split archive option to create multiple volumes.

Ok here is what i have done.

Split the 6GB in 1GB file using hjsplit. Then I tried to compress the 
first 1GB file with WinRAR and WinAce (splitting it again in 700MB 
volumes). I still got a CRC error when testing the compressed file!

I have been able to compress two other pst files of 500MB and 1GB 
without problem. However I'm running in exactly the same problem 
trying to archive a folder containing about 3GB of pdf files.

This one is puzzling me.

On Jan 27, 4:21 pm, "esieens" <esie...@chez.com> wrote:
> Ok here is what i have done.
>
> Split the 6GB in 1GB file using hjsplit. Then I tried to compress the
> first 1GB file with WinRAR and WinAce (splitting it again in 700MB
> volumes). I still got a CRC error when testing the compressed file!
>
> I have been able to compress two other pst files of 500MB and 1GB
> without problem. However I'm running in exactly the same problem
> trying to archive a folder containing about 3GB of pdf files.
>
> This one is puzzling me.
Strange thing, you can try to check hard disk and HD cable if they are 
ok.

HD Workbench is freeware S.M.A.R.T. need to be enabled in BIOS http://
www.diydatarecovery.nl/download.htm an other good one is Spinrite (pay 
software) what can create a boot CD and check and/or repair hard disks 
http://www.grc.com/sr/spinrite.htm

On Jan 27, 9:21 am, "esieens" <esie...@chez.com> wrote:
> Split the 6GB in 1GB file using hjsplit. Then I tried to compress the

Compress the entire 6gb file using winrar, and split into 1G chunks 
using winrar.  Don't split beforehand.  Now try it and see if it fails 
a test.