https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276522
--- Comment #1 from balc...@ste.no --- Having researched some more, I found this from https://manpages.ubuntu.com/manpages/xenial/en/man8/sg_format.8.html -- the documentation for the sg_format command: When this utility is used without options (i.e. it is only given a DEVICE argument) it prints out the existing block size and block count derived from two sources. These two sources are a block descriptor in the response to a MODE SENSE command and the response to a READ CAPACITY command. The reason for this double check is to detect a "format corrupt" state (see NOTES section). This usage will not modify the disk. This describes my scenario perfectly, including the "format corrupt" message which also appears in the ESXi logs. -- You are receiving this mail because: You are the assignee for the bug.