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The TS4500 tape library supports first generation (S54, S24) frames (HD1), and second-generation high-density (HD2) frames. HD2 frames like the first-generation HD1 frames, offer increased capacity without increasing frame size or required floor space by using high-density storage slots for tape cartridges. In addition, HD2 frames provide the following enhancements: 

GLYPH<SM590000> HD2 frames can be installed in the left-most position of the library (frame number 1). 

GLYPH<SM590000> Drive-capable HD2 frames support up to 16 HD2-compatible tape drives (3588 F7C, 3588 F6C, 3588 F5C, 3592 60E, 3592 60F, 3592 55E, 3592 55F, 3592 EH8, and 3592 EH7) when positioned as frame number 2 or higher. 

Generation 1 HD frames from TS3500 (Model S24 and S54) can be redeployed into a TS4500. These HD1 frames must be installed to the right of the Lx5 frame. These S24 or S54 (SX4) frames must have FC 1742 applied to them before they can exist in a TS4500 library string. 

Note:  The HD1 models S24 and S54 cannot be installed to the left of the Lx5 frame and cannot be installed as the right-most frame in a dual accessor tape library. 

The L25 and L55 (Lx5) frames and D25 and D55 (Dx5) frames are HD2, drive-capable frames, which means that they contain high-density cartridge storage slots, and slots to house up to 16 tape drives. The S25, S55 (Sx5) HD2 frames, and S54, S24 (SX4) HD1 frames, are storage-only frames, which means that they contain high-density cartridge storage slots, but no tape drives. All HD frames provide internal light-emitting diode (LED) lighting. 

The TS4500 also supports the addition of a top rack frame. The top rack, 3584 Model TR1, provides an extra 10U of rack space on any frame in a library without requiring more floor space. 

Table 14-2 lists the frames that are supported by the library and their specific media type and capacity. 

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