It is possible for 2 consecutive rips to produce matching T&C CRCs that are different from each other. It's rare, but it mostly happens when something obstructs the data from the laser (dust, f.ex.). It's very likely to happen when a drive does not support C2 but the option is still enabled in EAC. The track quality might even be 100%, as shown by the log, but it's a sure sign that the drive that is instructed to perform C2 correction cannot reliably flag the data as "in need of some serious C2 treatment" and does not correct it properly as a result. It's much more common to rip a CD which is already in its dying stages and come up with mismatching CRCs that are different every time you rip. These are the CDs that the best C2-capable drives (namely the Plextor PX-W1210A, off the top of my head) will be able to salvage the most accurate data from (as much as possible). With other drives you might have to slow down the reading speed to be able to avoid skips in those positions. What westgroveg describes is the most common situation. It's very possible that both drives do not correctly flag and correct common C2 errors and the only reliable way to rip this CD accurately is to use EAC without C2. It is also possible, though, that the rip made with C2 enabled is the correct one, if your drive is one of the reliable C2-capable drives. What you should do is rip the CD with the second drive and enable C2. See what the CRCs are and report here. If you specify the 2 drive models, we could have a more educated guess.