Agree, Les. I do wonder, however, why the previous backups with SyncBack did not alter the files ! Regards, Kevin. On Wed, Jan 25, 2012 at 4:02 AM, Les Hardy <[email protected]> wrote: > > Kevin, > I agree with David. I think that SyncBack is probably corrupting the images while compressing or encrypting them. > It's not so much file corruption, as image corruption. > The crc will be correct, because the syncback altered the file, rather than a corruption during copy. > > I saw similar results many years ago with the early compression software. > > Stripes on corrupt image files appear because of the way the lossy compression works. > The result varies depending on the file type. I'm guessing the images are JPEG. > > Can you send me a corrupt image to analyse? And the good version of the same image? > [email protected] > > Les Hardy > > > On 24/01/12 20:15, Kevin Ross wrote: > > Hi David, > > > > I can only guess that the files may somehow be compressed or encrypted > > when you do the last copy from the Laptop to the EHD.  Check the > > settings in your copy program (SyncBack SE). > > > > I also assume that you have checked to see that the photos on the > > Laptop are okay ? > > > > Do you have a program to compare files?  You could use this to do a > > comparison of the files on your Laptop to the folder on the EHD where > > you copied from the Laptop. > > > > I use a program called Beyond Compare, but it is not free. > > > > Perhaps Faststone Image Viewer may do the trick... > > http://www.faststone.org/FSViewerDetail.htm > > > > > > > > > > Regards, > > Kevin. > > > > On Mon, Jan 23, 2012 at 11:19 AM, David Railton > > <[email protected]>  wrote: > >> Kevin, > >> > >> I don't need to take a second copy but I am curious as to why it happens. Is > >> there, perhaps some problem I have with my computer system? I share a lot of > >> photos with others; and I would be interested to know if they are going to > >> experience problems copying my copies of copies. > >> > >> David > >> > >> -----Original Message----- > >> From: [email protected] [mailto:[email protected]] > >> On Behalf Of Kevin Ross > >> Sent: 23 January 2012 15:22 > >> To: [email protected] > >> Subject: Re: [COMPUTERS] Copying photos > >> > >> Hi David, > >> > >> I hear you, but I don't quite understand why you need to do a 2nd copy to > >> the EHD from the Laptop. > >> > >> You have the Photos on your PC, then your EHD, then your Laptop.  Why copy > >> them back to the EHD from the Laptop unless some changes are being done to > >> the Photos on your Laptop ? > >> > >> > >> Regards, > >> Kevin. > >> > >> > >> On Mon, Jan 23, 2012 at 10:09 AM, David Railton > >> <[email protected]>  wrote: > >>> The breaking up of the photos is into separate horizontal bands each > >>> having predominantly a single colour. > >>> > >>> I have a desktop pc to which I scanned the photos. I use SyncBack SE > >>> to automatically copy files to an external hard drive. Since scanning > >>> the photos I have purchased a laptop. I also use SyncBack SE to copy > >>> files from the laptop to a different folder on the same ehd. > >>> > >>> I copied from the ehd to the laptop without a problem. When this > >>> folder was then copied to its mirror on the ehd the photos broke up. > >>> What I have done to keep a good copy on the laptop ehd copy is to copy > >>> directly from pc ehd folder to laptop ehd folder. This laptop ehd > >>> folder does however get overwritten by the automatic copying process. > >>> It is not a major problem as I do have a good copy but would like to > >>> know why and if there is anything I can do about it. > >>> > >>> David > >>> > >>> -----Original Message----- > >>> From: [email protected] > >>> [mailto:[email protected]] > >>> On Behalf Of Kevin Ross > >>> Sent: 23 January 2012 13:45 > >>> To: [email protected] > >>> Subject: Re: [COMPUTERS] Copying photos > >>> > >>> Hi David, > >>> > >>> This is my interpretation of your process, as you described it... > >>> > >>> Scan>>  PC>>  Ext HD>>  Laptop>>  Ext. HD > >>> > >>> > >>> What is your operating system and how much memory do you have ? > >>> > >>> What programs/processes are you using to do all of this copying ? > >>> > >>> Why are you copying to so many locations ? > >>> > >>> Are you processing the photos along the way (i.e. Photoshop) ? > >>> > >>> When you copy to the Ext. HD the 2nd time, is it to the same folder > >>> (overwrite) or to a new folder ? > >>> > >>> What do you mean when you say the files "break up" ? > >>> > >>> > >>> Regards, > >>> Kevin. > >>> > >>> > >>> On Mon, Jan 23, 2012 at 8:31 AM, David Railton > >>> <[email protected]>  wrote: > >>>> I have scanned photos to my pc. These then get saved to the external > >>>> hard drive. I have then copied from the external hard drive to my > >>>> laptop. They then get saved again from the laptop to the external > >>>> hard > >>> drive. > >>>> > >>>> > >>>> No problems in scanning, saving to ehd and copying from ehd to laptop. > >>>> However, when they are copied a fourth time from the laptop to the > >>>> ehd they break up. > >>>> > >>>> > >>>> > >>>> Does anyone have any ideas why this happens? > >>>> > >>>> > >>>> > >>>> David > >>>> > >>>> > >>>> > >>>> > >>>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>>> > >>>> Please refrain from posting commercial URLs and from discussing > >>>> prices on > >>> the list. > >>>> Remember to SNIP when replying. > >>>> > >>>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>>> > >>>> > >>>> > >>>> > >>>> ------------------------------- > >>>> To unsubscribe from the list, please send an email to > >>>> [email protected] with the word 'unsubscribe' without > >>>> the quotes in the subject and the body of the message > >>> > >>> > >>> > >>> -- > >>> -------- > >>> K. Ross > >>> [email protected] > >>> > >>> > >>> > >>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>> > >>> Please refrain from posting commercial URLs and from discussing prices > >>> on the list. > >>> > >>> Remember to SNIP when replying. > >>> > >>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>> > >>> > >>> > >>> > >>> ------------------------------- > >>> To unsubscribe from the list, please send an email to > >>> [email protected] with the word 'unsubscribe' without the > >>> quotes in the subject and the body of the message > >>> > >>> > >>> > >>> > >>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>> > >>> Please refrain from posting commercial URLs and from discussing prices on > >> the list. > >>> Remember to SNIP when replying. > >>> > >>> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >>> > >>> > >>> > >>> > >>> ------------------------------- > >>> To unsubscribe from the list, please send an email to > >>> [email protected] with the word 'unsubscribe' without the > >>> quotes in the subject and the body of the message > >> > >> > >> -- > >> -------- > >> K. Ross > >> [email protected] > >> > >> > >> > >> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >> > >> Please refrain from posting commercial URLs and from discussing prices on > >> the list. > >> > >> Remember to SNIP when replying. > >> > >> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >> > >> > >> > >> > >> ------------------------------- > >> To unsubscribe from the list, please send an email to > >> [email protected] with the word 'unsubscribe' without the > >> quotes in the subject and the body of the message > >> > >> > >> > >> > >> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >> > >> Please refrain from posting commercial URLs and from discussing prices on the list. > >> > >> Remember to SNIP when replying. > >> > >> :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > >> > >> > >> > >> > >> ------------------------------- > >> To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message > > > > > > > > -- > > -------- > > K. Ross > > [email protected] > > > > > > > > > > :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > > > > Please refrain from posting commercial URLs and from discussing prices on the list. > > > > Remember to SNIP when replying. > > > > :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > > > > > > > > > > ------------------------------- > > To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message > > > > > :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > > Please refrain from posting commercial URLs and from discussing prices on the list. > > Remember to SNIP when replying. > > :-~:-~:-~:-~:-~:-~:-~:-~:-~:-~: > > > > > ------------------------------- > To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message -- -------- K. Ross [email protected]

Kevin, David sent me sample images, and I have seen this before. The image byte count is is the same. The file header is intact, but large chunks of the image data as been changed. I have asked David to tell me what operating systems he is using, and what format the external drive is. Too soon to say yet, but, the last time I say this, it was an operating system problem, so syncback may be innocent. Les Hardy On 25/01/12 12:08, Kevin Ross wrote: > Agree, Les. I do wonder, however, why the previous backups with > SyncBack did not alter the files ! > > Regards, > Kevin.