Arbitrary New "Last Modified" Date Changes

[john_baum1]

<p>I am running Win 7 Pro x65. I do not have iTunes installed on my desktop; it resides only on the iPhone.<br>

Last Tuesday I used a USB port to recharge my iPhone 5. I knew there were no new images on the phone. I was asked by the phone if I trusted by desktop (part of the standard process when downloading photos) and said yes. I charged the phone for about 45 minutes. Later I used ZTree to search for an image and was amazed to discover that about 3,500 jpg and png files all had their 'last modified' dates changed while the iPhone was attached.<br>

I know that modifying a JPEG file degrades its quality. What is the likelihood that the "mass modification" of these files as reported in the changed "Last Modified" date degraded them?<br>

I have backups for most of these images. If I restore them with their correct dates, has anyone any idea how to prevent this happening again.<br>

thanks<br>

baumgrenze</p>

<p> </p>

[Ed_Ingold]

<p>The "modified" date is EXIF data, which is attached to the image file but has no effect on the image itself. This date is changed each time you copy or move the image file. Neither of these operations affects the image quality.</p>