A reliable magnetic recording medium is provided which comprises a servo
signal unit portions formed in a concavo-convex shape, easily produced,
and resistant to tracking error. Also provided are a magnetic
recording/reproducing apparatus which incorporates the magnetic recording
medium, and a stamper for manufacturing the magnetic recording medium
with efficiency. The magnetic recording medium includes a recording layer
divided into a plurality of data areas and a plurality of servo areas to
record information. The recording layer is formed in a concavo-convex
shape in each servo area, with a servo signal unit portions formed as
either a convex portions or a concave portions of the concavo-convex
shape. Of the servo signal unit portions, the burst signal unit portion
for tracking is generally elliptical in shape when viewed from the
direction of thickness.