/sbin/hdparm cannot execute binary file after a reboot

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https://bbs.archlinux.org – I haven't seen anything like this before.  Upon rebooting:% hdparm /sbin/hdparm: /sbin/hdparm: cannot execute binary fileThe permissions are fine:ls -l /sbin/hdparm -rwxr-xr-x 1 root root 105440 Nov 3 02:47 /sbin/hdparmIf I capture its md5sum:% md5sum /sbin/hdparm 321ff7b32611a82c719ec7f7a7b5a67c /sbin/hdparmNow, I reinstall and everything is fine; note the DIFFERENT md5sum:% sudo pacman -S hdparm warning: hdparm-9.42-1 is up to date -- reinstalling resolving dependencies... looking for inter-conflicts... Targets (1): hdparm-9.42-1 Total Installed Size: 0.21 MiB Net Upgrad (HowTos)