Rectifying SubChannel data?! Whats that do?

[Machina]

When SubChannel reading is enabled in BlindWrite or Alcohol 120% - I can choose to RECTIFY SUBCHANNEL data. Is it the same thing as fixing WEAK sectors in BlindWrite?

I know that doing so makes the image NOT 1:1, but for my Playstation backup - the CD backup works a LOT better when I enabled the RECTIFY option.

What does it really do?



Also, another question out of whack - is it true that newest Alcohol 120% can make working (or is it 1:1????) SecuROM 5 and below images? The previous version could not read SecuROM 4.87 correctly for even a working backup.