== sanity-zero test 3a: truncate to a ZEROSTART boundary with an empty prev component ========================================================== 14:14:52 (1790705692) 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.209967 s, 5.0 MB/s 1+0 records in 1+0 records out 1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.169912 s, 6.2 MB/s