Patent ID: 7733597

Claim:
A magnetic tape cartridge comprising: a case which is formed by an upper half and a lower half which are combined together; a first reel to which a magnetic tape is wound, being rotatably contained in the case; a second reel which takes up the magnetic tape sent from the first reel, being rotatably contained in the case; a first rib which protrudes from each of the upper half and the lower half along a periphery of the first reel inside the case; a second rib which protrudes from each of the upper half and the lower half along a periphery of the second reel inside the case; a security tag which an external detector can detect; and an installation rib which is formed in at least one of the first rib and the second rib which protrude from the lower case, in order to hold the security tag, wherein the security tag is disposed on and separately from an inner surface of the lower half, and a center of the security tag is position in the upper half.