When I try to create a RAID1 array with ver 1.0 superblock using mdadm > 2.2 I'm getting: WARNING - superblock isn't sized correctly Looking at the code (and adding a bit more debugging) it is clear that all 3 checks fail in super1.c's calc_sb_1_csum()'s "make sure I can count..." test. Is this a regression in mdadm 2.4, 2.3.1 and 2.3 (NOTE: mdadm 2.2's ver1 sb works!)? please advise, thanks. Mike - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html