The 3584 Model D52 Expansion Frame is designed for holding IBM LTO Ultrium Fiber Channel tape drives and LTO data cartridges. Up to 15 Model D52 Expansion Frames may be added to the 3584 Model L22, L32, or L52 Base Frame to increase LTO cartridge storage or drive capacity. Each Model D52 supports up to 440 LTO cartridge slots and up to 12 IBM LTO Ultrium 2 Tape Drives, with an incremental reduction of storage slots for each set of four tape drives installed. Each frame can have up to 12 logical libraries or 12 control paths (one per tape drive).