MARC21-007: Groove width/groove pitch of sound recording
coarse/standard
Coarse or standard groove.
s
Discs issued at 78 rpm are usually coarse. Cylinders issued at 120 rpm (which have 100 grooves per inch) are usually standard.
microgroove/fine
Microgroove disc or a fine cylinder.
m
Discs issued at 16, 33 1/3, and 45 rpm are usually issued as microgroove. Cylinders issued at 160 rpm (which have 200 grooves per inch) are usually issued as fine.
not applicable
Item does not contain grooves.
n
Used for tapes and compact audio discs.
other
Groove width/groove pitch other than microgroove/fine, coarse/standard.
z
unknown
Groove width/groove pitch is not known.
u
Published