If you can learn medicine, you can pick up scans in about 5 minutes of reading
I have both of those drives. I love the Litey 160P6S .. I hate the pio111D .. just doesn't do as nice a job, and the PIO doesn't return consistent scan results either.
Here is how to interpret scans, the detailed & the quicky in one easy thread ..
The Litey is a 8/1 scanner, so the PI should be less than 300 for a decent disk, and the PIF must be less than 4.
Scanning is performed at 8x with CD/DVDspeed quality check (it comes with nero, but can be downloaded for free seperately).
For an excellent disc, your PI should be <50 and PIF less than 4.
For a fantastic disc, you PI should be <20 and PIF less than 4.
PIF is the important one Don't spend you life trying to get exceptionally low PI results, like some freaks
Don't worry too much about a single spike on a disk. It's not important.
Watch out for the mountains though .. those are believably bad
And remember, there are lots of factors in burning & scanning, including batch variation, burner firmware, software, which way the wind is blowing today.
The largest issue is the media though. Crap media is cheap for a reason. As a doctor, I expect that you understand that time is precious. Good quality media like Taiyo Yuden & Mitsubishi (MCC)/Verbatim media is well worth the extra few $$$, as it hurts to lose somethin you want/need, and almost as bad if you have to waste time recovering data from a bad disc & reburning it.