Keep mine on a spindle... beter on smaller spindles though rather than 100 disc spindles
By the way just about any DVD+R should work DVD-R are a hell of alot more picky, alot of DVD-R's will just not work at all, there are very few DVD+R's that will fail though and I have also used some very cheap ones in the past, but thats where that stays in the past
alot of those do not work now and have degraded with light more than anything, quality DVD's don't do that
Best bet is just to check the guide I linked and get more info on your media before you buy it, every brand has various grades aswell so me just saying get Verbatim wasn't the best way to say because even some verbatims are not going to work on the PS2