the disc pack 200 the disc pack 200 is provided with a shutter 230 movable in directions in paralled to one side of the disc pack 200 as indicated by a double headed arrow 228 when this shutter 230 is moved to a position opposite to the position as shown an opening of the casing 222 disposed thereunder is exposed so that an adjusting plate 64 and the magnetic head 26 of the reproducing apparatus 100 can be approached or abutted against the magnetic disc 10 as shown in fig4 a the disc pack 200 receiving therein the disc 10 is inserted into a bucket 102 thereof in order to be loaded in this apparatus 100 tht bucket 102 detachably receives therein the disc pack 200 and holds the same and supported in the casing 1 of this apparatus 100 in a manner to be rotatable about an intersection 104 the bucket 102 is normally biased by biasing means 106 in a direction opposite to direction indicated by an arrow a so that the disc pack 200 can be taken out of the bucket 102 at a position shown in fig4 a when the disc pack 200 is inserted into the bucket 102 and the bucket 102 is pushed in the direction indicated by the arrow a an engageable member 108 is operated in association therewith the bucket 102 slides in a direction indicated by an arrow b.