A
CD-Maxisingle (or
Maxi-CD), often
abbreviated in this way by
record companies and
stores. A CDM is a
CD that has more
tracks than a
single, but not as many as a (
full-length)
CD-album.
Usually this means 4-7 tracks, with up to
half an hour of
playing time.
A CDM is (usually) equivalent to an EP.