blk_nblock$(nW)TEST2: START: blk_nblock
 $(nW)blk_nblock$(nW) 512:$(nW)testset1 512:$(nW)testset2
$(nW)testset1: block size 512 usable blocks: 129728
$(nW)testset2: block size 512 usable blocks: 259776
blk_nblock$(nW)TEST2: DONE