As the disc/spin motor ages, it becomes difficult to retain correct speed as it progresses through the disc. Therefore, if you get a CD player that reads TOC and plays the first few tracks fine but then mistracks further and further into the disc, you may often find that a failed spin motor is the culprit.

it's actually the reverse for the spindle motor. Because the CD starts from the centre and due to CLV tracking, it has the hardest time reading the TOC and the first few tracks. The disc spins at roughly 500rpm at the centre slowing to about 200rpm at the outer edge. CLV stands for constant linear velocity and and relates to the data rate being read off the disc. Because there is less data on the inner tracks compared to the outer tracks, the disc must spin faster in this region.

A well aligned CD lens will read the TOC data in 3-5 secs but PB is dependant on how well the spin motor works at low rpm at the edge

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