For BDAM/QSAM libraries, the default block size of 3120 results in 15 blocks per track and 82.6% utilization of the space. Increasing block size to 3174 results in 84% utilization (still at 15 blocks per track). Increasing it to 27998 (2 blocks per track) results in 98.8% utilization. Reducing it to 820 (39 blocks per track) results in 56.4% utilization.
BDAM Fixed (F) libraries are supported; Fixed Block (FB) BDAM libraries are not supported.