Listen to this advice! it does make a difference!!
Many moons ago (old timers dit!) on my first ps2 i could get bulkpaq (YUK!!) to boot on my ps2, for about 3 months, then became very unreliable and erratic. eventually only booting originals and then only sometimes. Stick to the tried an tested brands (DVDMaster, Traxdata, Ridata, Ritek). They are the best for yr laser and will ensure max life from yr ps2.