Edit:And another tip, use cdr's burned at as low a speed as you can. Those old readers have a better chance at being able to read cdr's written at say 2x speed, like I used to do.
Is that really, actually, honestly true? It always struck me as a wives' tale, as I've never seen any real, concrete evidence of burn speed affecting readability unless the disc itself couldn't take it to begin with.
It's how I've always burned my disks and even the audio cd's I've burned at low speed on 'noname' disks are still readable as many disks I've gotten from friends burned at max speed have tons of errors on them now.
A friend of mine who is also a musician told me he found ot that when burning at higher speed his car cd player couldn't read audio disks burned at higher speeds but could read them better when burned at lower speed, using the same burner and the same disks.
The higher speed disks were made to burn as fast as they did because they (the manufacturer) could sell more of them, not because they became more reliable. This includes both the disks and the drives. However, faster media doesn't always mean it's more reliable and I've always preferred reliability over speed.
I've also noticed this myself, burning a disk faster will make it more likely it can't be read by some readers (this includes my now ancient audio disk drive in my livingroom and some older pc-cdrom drives) or will sometimes read and sometimes be unreadable. The slower I burned them the more reliable they became and the longer they seem to remain readable.
Perhaps the modern burners and disks don't have this issue anymore but a) I hardly ever use a burner anymore and b) We -are- talking ancient (2nd) generation cdrom drives here.
Now I kinda never burn any disks actually, only an audio cd once in a blue moon (USB storage ftw 😀 )
Edit: Mind you, I present you with not scientific evidence here but -everything- I've noticed in the 5-odd years burning cd's almost weekly or even daily told me what I wrote above is true.
I don't need a scientific paper about this, I've experienced this 1st hand 😉