CD-ROM-XA standard
There are essentially two types of XA drives:
1) Mode 2 Form 1 data drives. These can read the Mode 2 Form 1 sectors of XA
discs that are used for storing data that does not follow the XA audio or video
data spec.
2) Full XA drives. These drives include audio and video processing to handle
XA Mode 2 Form 2 sectors.
Note that PhotoCD discs only use Mode 2 Form 1 sectors! They do not use the
special Form 2 XA video format. Therefore, a drive that claims to be PhotoCD
compatible may be only partially XA compatible. However, a drive that is fully
XA compatible should be at least single-session PhotoCD comptible IF you also
have the software to decode the PhotoCD picture format.