This is interesting because B&W is oversize and requires an 80' disc

Neither is the 1610A known to be picky as it's Media Catalogue & OPC are excellent. There are reports of bad 1610As but I think the owners use recycled CD-Rs made from old tyres.
I think the subs thing was incidental to the game being written onto a 700Mb disc not 650 as stated - this would be very interesting if the disc was indeed 74'.
If the Toshi did the read, a reliable image would result with FES settings of Hardware & zero retries. More than 1 is asking for trouble and subs has the potential to introduce uncorrectable errors.
Euro (which Oz gets many of) & North American versions are SD2. I have seen other reports of subs used but again I think it's incidental to a good re-read
