how to detect corrupted file

plowmail2010 at plowmail2010 at
Tue Apr 11 17:13:53 BST 2023

Yes, disk space can be a problem.  On the other hand, compare the cost 
of disks to the value of your files.  1 TB SSD's run about $65 USD.  A 2 
TB disk is about $60.
My search for "validate jpg files" revealed several candidates, but they 
seem intended for programmer/geek people.  For example, the JPG data 
begin with FFD8 hex and end with FFD9.  So all you need do is find or 
write a program to test for those values.  And sure enough, people have 
done that, if you can figure out how to build/install on unix/linux.
Maybe this repair site will help: I have not tried it.
(Confession: I am a former programmer/geek.  Now I am just a geek.)


On 4/11/2023 10:51 AM, frederic chaume wrote:
> I'm using FreefileSync each time I import new raw files. It includes a 
> version management, but I had to remove it the because of the disk 
> space used,  so today  I'm relying on the network trashbin plus a 
> regular backup on an another disk.
> But clearly not enough 🙁
> What could help is to be able to validate the integrity of the 
> collections and/or the backup. So if any idea is welcome
> Frederic
> Le 11/04/2023 à 16:34, plowmail2010 at a écrit :
>> On 4/11/2023 6:30 AM, frederic chaume wrote:
>>> my concern is that running another backup may overwrite the correct 
>>> file by a acorrupted version, that's why I'm trying to make a check 
>>> before another backup
>> Off on a tangent...
>> If your backup procedure can overwrite older backups, you need to use 
>> a better backup.
>> I, too, am a victim of Windows.
>> I use Macrium Reflect ($69 USD).
>> I don't know how to make it overwrite earlier backups.  It's probably 
>> impossible.
>> Bob
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