Date: Sun, 25 Sep 2016 20:36:15 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: freebsd-questions@freebsd.org Subject: FreeBSD-10.3-RELEASE-i386-memstick.img installer changes contents of USB flash drive? Message-ID: <56532342-f2d4-377d-605b-2e1b5bfb2160@holgerdanske.com>
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freebsd-questions: Using Debian GNU/Linux 7.11, I downloaded FreeBSD-10.3-RELEASE-i386-memstick.img and burned it to a USB flash drive: # time dd if=FreeBSD-10.3-RELEASE-i386-memstick.img of=/dev/sdc bs=1M conv=sync; sync 659+1 records in 660+0 records out 692060160 bytes (692 MB) copied, 141.567 s, 4.9 MB/s real 2m21.571s user 0m0.004s sys 0m1.696s If I compute the checksum immediately after burning, it matches the published checksum: # time dd if=/dev/sdc count=1350917 | sha256sum -b ab104a30627754bb8d39eeff3c5c5a4a15537d32c749e2b9841b34cb08e17eb0 *- 1350917+0 records in 1350917+0 records out 691669504 bytes (692 MB) copied, 43.252 s, 16.0 MB/s real 0m43.257s user 0m7.236s sys 0m3.496s # grep ab104a30627754bb8d39eeff3c5c5a4a15537d32c749e2b9841b34cb08e17eb0 CHECKSUM.SHA256-FreeBSD-10.3-RELEASE-i386 SHA256 (FreeBSD-10.3-RELEASE-i386-memstick.img) = ab104a30627754bb8d39eeff3c5c5a4a15537d32c749e2b9841b34cb08e17eb0 But after using the USB flash drive to install FreeBSD, the checksum has changed: # dd if=/dev/sdc count=1350917 | sha256sum -b 1350917+0 records in 1350917+0 records out bd159b85486322febe992226bbec9c86d96d70dd1e5a8b7c6f0bb9d29eb50df3 *- 691669504 bytes (692 MB) copied, 42.989 s, 16.1 MB/s Therefore, the FreeBSD-10.3-RELEASE-i386-memstick.img installer has changed the contents of the USB flash drive. Why? David
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