That date-beyond-which-it-won't-play-CDRs thing is kinda bogus info.
I have a Dreamcast with a Dec 2000 date that plays CDRs no problem.
Supposedly Oct 2000 was the cutoff, but this is clearly not the case.
On SlashDot, someone who used to work at Sega says that the Dreamcast
machines were originally not going to be able to play CDRs at all.
Then cost considerations with respect to the GDRs that they are
supposed to play lead Sega to modify the firmware so that they
could play CDRs. From my understanding, the mod was not so they
could play CDR retail games (the retail games are all GDRs), but
so that they could play CDRs sent as pre-release games to reviewers
and whatnot. Anyway, Sega made the change, the hackers went to work,
and soon people were playing CDR copies downloaded from the net.
General vendor/softwarehouse unhappiness ensued and Sega was ultimately
convinced to change the firmware so that you could not play CDRs.
But that was very late in the production run, and the no-CDR firmware
chips were used only as the earlier chips ran out...Apparently
(based on my Dec2000 machine), the chips didn't run out for a long
time, at least on some assembly lines.
Kwad