Quote:
Originally Posted by drmjh
I
Hi,
I wanted to bring some jpeg picture files from a BkUp copy on a dvd to my desktop and got this Msg.
"Error interpreting jpeg file! (not a jpeg file, starts with 0x20 0x20.)
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Hi there you guys.. I read this thread earlier today but hadn't anything to add, but now I have a question or two, or a comment or two:
1) You're restoring a backup. So, it shouldn't matter what kind of files are being (backed up or) restored. Therefore, I'm curious why the backup-restoring-command you're using, whatever it is, is complaining that the file(s) are "not a jpeg file"? How or why would the backup-restoration command know or care
what exactly was being copied?
Or, have I misunderstood, and what's
really happening is that the files have been restored, and now, some jpeg viewing program is doing the complaining about the file types?
Nobody asked what command(s) or tools you're using to restore the backup - so what
are you using?
2) Admittedly I'm not familiar with every possible permutation of the `growisofs` command, and I haven't ever used it to backup an entire folder or partition, such as /home. However, one thing I don't see in your backup command is a -speed= setting. Therefore, your backup was probably made at a high speed. This might be a contributing factor in why you have corrupted images.
Was the backup media checksummed or otherwise verified to be accurate, after it was made?
Here's an interesting excerpt from the `growisofs` manpage:
Quote:
-speed=N
An option to control recording velocity. Most commonly you'll use -speed=1 with "no-name" media, if default speed setting messes up the media. Keep in mind that N essentially denotes speed closest to N*1385KBps in DVD ...
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So with that, what brand of discs did you use for the backup? Nice ones, or cheapo ones?
3) In searching a little bit earlier today, I came across a whack of google results talking about the same error message you are getting, about the 0x20 file header and filetype being wrong. One thing that was common among many of these google results I looked at, was the claim that backed up images (and probably files of any type) can degrade or deteriorate over time. Since it's already known that optical media doesn't last indefinitely, it's possible that your corruption is being contributed to by the age or quality of the media, combined with storage conditions (very warm or cold, direct sunlight, etc..) and as mentioned earlier, burn speed of the backup.
Anyways.. Some stuff to think about.
Cheers!