Not usually, its the same with HD's. You can't get the raw signal data from the drive unless you have special firmware, or find a hidden read command somewhere.

Not usually, its the same with HD's. You can't get the raw signal data from the drive unless you have special firmware, or find a hidden read command somewhere. The drive can't necessarily even pick "wrong" data to send you because there are a lot more failure cases than "I got a sector but the ECC/CRC doesn't match". Embedded servo errors can mean it can't even find the right place, then there are likely head positioning and amp tuning parameters which generally get dynamically adjusted on the fly. This AFAIK is a large part of why reading a "bad" sector can take so long. Its repeatedly rereading it trying to adjust/bias those tuning parameters in order to get a clean read. And there are multiple layers of signal conditioning/coding/etc usually in a feedback loop. The data has to get really trashed before its not recoverable, but when that happens it good and done. (think about even CD's which can get massively scratched/damaged before they stop playing).