Second hard drive gone?! *HELP*

[Burn:Cycle]

Below is my system log output. It looks like an update tried to run and now my second hard disk is nowhere to be found!

I am running an ASUS G75VW w/ 16gb RAM, and Intel Core i7-363QM @ 2.40GHz x 8, with an Nvidia GeForce GTX 670m

Any help on figuring out what went wrong and IF I can recover that drive would be greatly appreciated! Thanks in advance!!

Sep 30 06:59:14 glados anacron[15255]: Job `cron.daily' terminated
Sep 30 06:59:14 glados anacron[15255]: Normal exit (1 job run)
Sep 30 07:00:17 glados udisksd[1238]: Error performing housekeeping for drive /org/freedesktop/UDisks2/drives/Hitachi_HTS727575A9E364_J3740084HYKY3E: Error updating SMART data: sk_disk_check_sleep_mode: Operation not supported (udisks-error-quark, 0)
Sep 30 07:00:17 glados rsyslogd0: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/0 ]
Sep 30 07:00:17 glados rsyslogd-2359: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/2359 ]
Sep 30 07:09:01 glados CRON[15556]: (root) CMD (  [ -x /usr/lib/php5/sessionclean ] && /usr/lib/php5/sessionclean)
Sep 30 07:10:17 glados udisksd[1238]: Error performing housekeeping for drive /org/freedesktop/UDisks2/drives/Hitachi_HTS727575A9E364_J3740084HYKY3E: Error updating SMART data: sk_disk_check_sleep_mode: Operation not supported (udisks-error-quark, 0)
Sep 30 07:17:01 glados CRON[15581]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Sep 30 07:20:17 glados udisksd[1238]: Error performing housekeeping for drive /org/freedesktop/UDisks2/drives/Hitachi_HTS727575A9E364_J3740084HYKY3E: Error updating SMART data: sk_disk_check_sleep_mode: Operation not supported (udisks-error-quark, 0)
Sep 30 07:30:01 glados CRON[15589]: (root) CMD (test -x /etc/init.d/anacron && /usr/sbin/invoke-rc.d anacron start >/dev/null)
Sep 30 07:30:01 glados anacron[15609]: Anacron 2.3 started on 2015-09-30
Sep 30 07:30:01 glados anacron[15609]: Normal exit (0 jobs run)
Sep 30 07:30:17 glados udisksd[1238]: Error performing housekeeping for drive /org/freedesktop/UDisks2/drives/Hitachi_HTS727575A9E364_J3740084HYKY3E: Error updating SMART data: sk_disk_check_sleep_mode: Operation not supported (udisks-error-quark, 0)

[duxim]

did you try
fdisk -l
to see if it show your disk or try with gparted if it cold see your disk
read this. it maybe helpfull
http://www.thegeekstuff.com/2010/09/linux-fdisk/

[Burn:Cycle]

Neither option works. It's as if it' just gone!