Patent ID: 7384700

Claim:
A magnetic tape cartridge comprising: a reel; a magnetic tape; a leader tape joined at a tip of the magnetic tape to be loaded into a magnetic recording and reproducing apparatus; a cartridge case rotatably housing the reel on which the magnetic tape is wound, wherein the leader tape comprises a support and a coating layer containing powder and a binder, wherein at least one surface of the leader tape has a center line average surface roughness (Ra) of from 10 to 60 nm, and depression hardness (DH) defined by the following equation (1) of from 60 to 140 kg/mm 2 (0.588 to 1.372 GPa): DH −3.7926×10 −2 [Pmax /( Hmax ) 2 ]kg/mm 2 ) (1) wherein Pmax is a maximum load and Hmax is a maximum displacement amount of an indenter.