Sometimes when ripping a CD the track numbers are created as 3 digits. Usually they are 2 digit numbers. (001 instead of 01) This happens only in some CDs, e.g. The Original Jacket Collection of Eugene Ormandy, ripped as individual CDs not as a continuous set.
Why does this happen? How can I force 2-digit numbers for tracks 99 or less?
This is connected to the number of CDs of the CD set. If there are 3 or more CDs in the set, the track numbering will be 3 digit numbers. It is only a heuristic, as also 2 CDs can have more than 100 tracks or 4 CDs less than 100 tracks.