So, none of the Lite-On Y series drives can be flashed into their Optiarc equivalents? The bootcodes are all different, and none has an exact match with it's Optiarc sibling? That's disappointing. I though that at the least, the iHAS324 Y would be a direct match for the AD-7240S.
Also, the iHAS124Y, DH-24AYS, and iHAS324Y are really all the same hardware as the AD-7240S, except for the bootcode? Nothing different other than that one thing? That's hilarious how they took one drive and artificially made it into three.
So basically, you don't really want to buy one of these Lite-On Y drives, not because they aren't good drives, but because there is always the lurking danger that at some point, firmware updates will stop for that line, while the original Sony/Optiarc drives continue to get support. We've seen that happen time and time again with rebadges, but normally, cross-flashing solves the problem.