Hi fellas...again, thanks for your input and time. 1) I looked around my Avast interface and found a possible link: Open Avast Interface/Real-Time Shield/File System Shield/Expert Settings/'Scan When Attaching'/untick 'Scan Auto-run items when removable media attached/OK 2) I also thought that turning of Windows 7 'Indexing' might help: Start/type:'services.msc'/scroll to 'Windows Search'/Properties/select 'Disabled'/Apply 3) I also turned off 'Auto Play' This all seemed to improve matters - but not by much. By way of added comment: my 'jpg' files are set out in different folders. I'm accessing a folder at a time and like I said, it's a chore. Also, I meant to add I have TWO of the same Liteons in my tower and both behave the same way. I've tried using different branded media - same result. One other thing I've noticed since I did the above: even when I've exited the folder and indeed Windows Explorer, the light on the rewriter continues to blink as if the damn thing is STILL reading! Only by pressing the 'Eject' button, does this stop. This never happened before...grrrrr! I did wonder if all this had something to do with Windows 'swap-file' or whatever it's called, but with 8Gb memory that shouldn't have anything to do with it, should it? Since the Liteon handles all other functions with no problem, I have to conclude it's not the unit itself that's the culprit...again, I have two of them, both operating perfectly in all other respects. Any other suggestions? There has to be a simple answer to this... Regards