Date: Tue, 24 Jul 2012 11:06:13 -0500 From: "Sam Zehr" <sam@athyriogames.com> To: <freebsd-fs@freebsd.org> Subject: Make disk completely read-only? Message-ID: <02b201cd69b6$413ea000$c3bbe000$@com> In-Reply-To: <CAPS9%2BStQY%2B3W3aYHaXsqOeFGus18Mt0x1pGV1OTYOvRc1Wf=vw@mail.gmail.com> References: <01bf01cd66d4$84756b40$8d6041c0$@com> <CAPS9%2BStQY%2B3W3aYHaXsqOeFGus18Mt0x1pGV1OTYOvRc1Wf=vw@mail.gmail.com>
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Hi, this is Sam again, working on making a USB flash drive in FreeBSD 9.0 _completely_ read-only. Disk is mounted read-only - fstab has ro,noatime Following some advice from the list, I've done some binary compares to see what is going on. It looks like only a few bytes are changing every time I reboot, they seem to correspond with the superblock locations - I would guess a timestamp of mount time? I executed the dumpfs command after a few boots, and checked for differences. The only thing that is changing is from the first line Pass 1: magic 19540119 (UFS2) time Mon Jul 23 11:12:06 2012 superblock location 65536 id [ 4fe363f7 e7fd3a99 ] Pass 2: magic 19540119 (UFS2) time Mon Jul 23 11:28:35 2012 superblock location 65536 id [ 4fe363f7 e7fd3a99 ] Does anyone know of a way to stop this timestamp from occurring? Sam
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