blk_non_zero$(nW)TEST6: START: blk_non_zero
 $(nW)blk_non_zero$(nW) 512 $(nW)testfile1 c $(N) w:0 r:1 r:0 w:1 r:0 r:1 r:2
512 block size 512 usable blocks 2080567
is zeroed:	1
write     lba 0: {1}
read      lba 1: {0}
read      lba 0: {1}
write     lba 1: {2}
read      lba 0: {1}
read      lba 1: {2}
read      lba 2: {0}
blk_non_zero$(nW)TEST6: DONE