The IBM 6173 are TS3100 Tape Library Model L2U (machine type 6173, SEO #61732UL) and IBM TS3200 Tape Library Model L4U (machine type 6173, SEO #61734UL) that incorporate the LTO Ultrium 6 full-high 8 Gb Fibre Channel, half-high 6 Gb SAS, and half-high 8 Gb Fibre Channel tape drives, enhancing tape performance over the previous generation of IBM LTO Ultrium 5 tape drives with a native data transfer rate of up to 160 MB/sec.