Disc storage apparatus and disc archive apparatus

A disc archive apparatus comprising:

• a disc storage apparatus capable of storing N rows of stacked M discs (N and M each indicate a positive integer of two or greater);
• first and second storage racks including a plurality of storage sections, each storage section having front and rear openings and configured to allow the disc storage apparatus to be mounted/taken out through the openings;
• a conveying robot configured to select the disc storage apparatus specified and convey the disc storage apparatus through the front opening of each of the first and second storage racks;
• a disc drive including a plurality of drives configured to perform recording on or reproducing from disc-shaped recording media in the disc storage apparatus conveyed by the conveying robot;
• and
• a disc conveying picker configured to set the discs from the disc storage apparatus into each of the drives of the disc drive,
• wherein the disc storage apparatus stores N rows of stacked M disc-shaped recording media (N and M each indicate a positive integer of two or greater) in a case having an opening on an upper surface of the case, and
• in a case where the disc storage apparatus is taken out from the rear opening of one of the storage sections of the second storage rack, a tray cover slides from the rear opening and covers the opening and the disc storage apparatus is taken out with the tray cover covering the opening.